diff --git a/project.godot b/project.godot
index 4862c51..f156776 100644
--- a/project.godot
+++ b/project.godot
@@ -18,16 +18,20 @@ config/icon="res://icon.svg"
 
 [autoload]
 
-AsyncResourceHandler="*res://src/async_resource_handler.ts"
+AsyncResourceHandler="*res://src/global/async_resource_handler.ts"
 Console="*res://addons/dev_console/console.tscn"
-DebugDraw="*res://src/debug_draw.ts"
-MessageBus="*res://src/message_bus.ts"
-SaveSerializer="*res://src/save_serializer.ts"
+DebugDraw="*res://src/global/debug_draw.ts"
+MessageBus="*res://src/global/message_bus.ts"
+SaveSerializer="*res://src/save_system/save_serializer.ts"
 
 [editor]
 
 script/search_in_file_extensions=PackedStringArray("gd", "gdshader", "ts")
 
+[global_group]
+
+save=""
+
 [input]
 
 move_left={
diff --git a/resources/items/handgun.tres b/resources/items/handgun.tres
index 5c31277..123073e 100644
--- a/resources/items/handgun.tres
+++ b/resources/items/handgun.tres
@@ -1,6 +1,6 @@
 [gd_resource type="Resource" script_class="Weapon" load_steps=2 format=3 uid="uid://c15pu3ela0g6k"]
 
-[ext_resource type="Script" uid="uid://tv71bu1y658n" path="res://src/weapon.ts" id="1_bp18i"]
+[ext_resource type="Script" uid="uid://tv71bu1y658n" path="res://src/item/weapon.ts" id="1_bp18i"]
 
 [resource]
 script = ExtResource("1_bp18i")
@@ -8,8 +8,8 @@ name = &"Handgun"
 description = ""
 max_quantity = 99
 scene = "uid://ddgak6clk2i2p"
-range = 100.0
+damage = 1.0
+range = 25.0
 fire_rate = 0.5
 capacity = 9
-damage = 1.0
 metadata/_custom_type_script = "uid://tv71bu1y658n"
diff --git a/resources/items/key.tres b/resources/items/key.tres
index 7217c31..58df4ad 100644
--- a/resources/items/key.tres
+++ b/resources/items/key.tres
@@ -1,6 +1,6 @@
 [gd_resource type="Resource" script_class="Item" load_steps=2 format=3 uid="uid://5odv3n0dp2nn"]
 
-[ext_resource type="Script" uid="uid://tgca2vcp2tt4" path="res://src/item.ts" id="1_bbxre"]
+[ext_resource type="Script" uid="uid://tgca2vcp2tt4" path="res://src/item/item.ts" id="1_bbxre"]
 
 [resource]
 script = ExtResource("1_bbxre")
diff --git a/scenes/node_3d.tscn b/scenes/node_3d.tscn
index d4874c0..b32a143 100644
--- a/scenes/node_3d.tscn
+++ b/scenes/node_3d.tscn
@@ -3,11 +3,11 @@
 [ext_resource type="PackedScene" uid="uid://cersx8w4ps2sr" path="res://scenes/player.tscn" id="1_uum5p"]
 [ext_resource type="Script" uid="uid://cgbd6grygtxvj" path="res://src/main_camera.ts" id="2_0n32s"]
 [ext_resource type="PackedScene" uid="uid://cwrgvwx3lfwf6" path="res://assets/level.glb" id="2_i3oty"]
-[ext_resource type="Script" uid="uid://cyll634iylhqg" path="res://src/interactable.ts" id="3_dt0nx"]
+[ext_resource type="Script" uid="uid://cyll634iylhqg" path="res://src/interactable/interactable.ts" id="3_dt0nx"]
 [ext_resource type="Script" uid="uid://1w0aiix6vgbc" path="res://src/interactable/door.ts" id="3_imxmk"]
 [ext_resource type="Resource" uid="uid://5odv3n0dp2nn" path="res://resources/items/key.tres" id="4_3rynd"]
-[ext_resource type="Script" uid="uid://c7s3k1qy8pg3s" path="res://src/item_pickup.ts" id="6_qe67v"]
-[ext_resource type="Script" uid="uid://bccrrtp3mlw5i" path="res://src/health.ts" id="8_cptob"]
+[ext_resource type="Script" uid="uid://c7s3k1qy8pg3s" path="res://src/item/item_pickup.ts" id="6_qe67v"]
+[ext_resource type="Script" uid="uid://bccrrtp3mlw5i" path="res://src/entity/health.ts" id="8_cptob"]
 
 [sub_resource type="WorldBoundaryShape3D" id="WorldBoundaryShape3D_y41n8"]
 
diff --git a/scenes/player.tscn b/scenes/player.tscn
index 64f0831..d4c0667 100644
--- a/scenes/player.tscn
+++ b/scenes/player.tscn
@@ -1,12 +1,13 @@
-[gd_scene load_steps=34 format=3 uid="uid://cersx8w4ps2sr"]
+[gd_scene load_steps=35 format=3 uid="uid://cersx8w4ps2sr"]
 
-[ext_resource type="Script" uid="uid://dxiv1svdeoxg2" path="res://src/player.ts" id="2_pdrhn"]
-[ext_resource type="Script" uid="uid://hm6oqbvcmigk" path="res://src/player_animation.ts" id="3_26yay"]
-[ext_resource type="Script" uid="uid://ny0p0jkmlrv8" path="res://src/player_input.ts" id="3_x6527"]
-[ext_resource type="Script" uid="uid://kjthk4tj8qof" path="res://src/interactor.ts" id="5_uk7c1"]
-[ext_resource type="Script" uid="uid://dkvbawcldnok5" path="res://src/equipped_weapon.ts" id="6_fjrip"]
-[ext_resource type="Script" uid="uid://dbrjcvaqkca21" path="res://src/inventory.ts" id="6_jscba"]
+[ext_resource type="Script" uid="uid://dxiv1svdeoxg2" path="res://src/entity/player.ts" id="2_pdrhn"]
+[ext_resource type="Script" uid="uid://hm6oqbvcmigk" path="res://src/entity/player_animation.ts" id="3_26yay"]
+[ext_resource type="Script" uid="uid://ny0p0jkmlrv8" path="res://src/entity/player_input.ts" id="3_x6527"]
+[ext_resource type="Script" uid="uid://kjthk4tj8qof" path="res://src/entity/interactor.ts" id="5_uk7c1"]
+[ext_resource type="Script" uid="uid://dkvbawcldnok5" path="res://src/entity/equipped_weapon.ts" id="6_fjrip"]
+[ext_resource type="Script" uid="uid://dbrjcvaqkca21" path="res://src/entity/inventory.ts" id="6_jscba"]
 [ext_resource type="PackedScene" uid="uid://sgc1gxq4osag" path="res://scenes/player_mesh3.tscn" id="7_fjrip"]
+[ext_resource type="Script" uid="uid://bccrrtp3mlw5i" path="res://src/entity/health.ts" id="8_smehm"]
 
 [sub_resource type="CapsuleShape3D" id="CapsuleShape3D_1kx10"]
 
@@ -126,13 +127,144 @@ states/Unarmed/node = SubResource("AnimationNodeBlendSpace1D_7bso7")
 states/Unarmed/position = Vector2(405, 89)
 transitions = ["Start", "Unarmed", SubResource("AnimationNodeStateMachineTransition_cqw7m"), "Unarmed", "Handgun", SubResource("AnimationNodeStateMachineTransition_fjrip"), "Handgun", "Unarmed", SubResource("AnimationNodeStateMachineTransition_smehm"), "Start", "Handgun", SubResource("AnimationNodeStateMachineTransition_ur7pv")]
 
-[node name="Player" type="CharacterBody3D"]
+[node name="Player" type="CharacterBody3D" groups=["save"]]
 script = ExtResource("2_pdrhn")
+metadata/_custom_type_script = "uid://dxiv1svdeoxg2"
 
 [node name="Mesh" parent="." instance=ExtResource("7_fjrip")]
 
+[node name="Skeleton3D" parent="Mesh/AuxScene/Scene/Armature" index="0"]
+bones/0/position = Vector3(-1.74887, 91.964, -0.714319)
+bones/0/rotation = Quaternion(0.165541, -0.00688532, -0.0607779, 0.984304)
+bones/1/position = Vector3(-5.73688e-07, -9.14512e-06, -1.26241e-06)
+bones/2/rotation = Quaternion(-0.05258, -0.0688082, 0.0497405, 0.995001)
+bones/3/position = Vector3(9.31323e-07, 4.82425e-06, 3.63451e-07)
+bones/4/rotation = Quaternion(0.0222017, -0.0213405, 0.0167214, 0.999386)
+bones/5/position = Vector3(-1.93715e-07, -5.33462e-06, -3.29316e-06)
+bones/6/rotation = Quaternion(0.0349434, -0.0206503, 0.0167813, 0.999035)
+bones/7/position = Vector3(7.1526e-07, -1.93864e-05, -4.64916e-06)
+bones/8/rotation = Quaternion(-0.51501, 0.549661, -0.50159, -0.425494)
+bones/9/position = Vector3(4.03821e-06, 2.32458e-06, -8.17219e-06)
+bones/10/position = Vector3(-1.57305e-06, 10.8382, 6.06992e-05)
+bones/10/rotation = Quaternion(0.394962, -0.363464, -0.0296416, 0.84322)
+bones/11/position = Vector3(4.29218e-06, -5.19505e-06, 6.01416e-06)
+bones/12/rotation = Quaternion(-1.62516e-07, 3.07216e-08, -0.699315, 0.714814)
+bones/13/position = Vector3(-8.38905e-06, 3.33295e-06, 2.61253e-06)
+bones/14/position = Vector3(-3.8591e-06, 28.3289, 4.04304e-06)
+bones/14/rotation = Quaternion(-0.136096, 0.156416, -0.0262674, 0.977917)
+bones/15/position = Vector3(3.578e-06, -5.33786e-07, -1.20217e-06)
+bones/16/rotation = Quaternion(0.585477, -0.0341162, 0.207056, 0.783058)
+bones/17/position = Vector3(-5.2056e-06, -2.74507e-06, 2.17486e-07)
+bones/18/position = Vector3(-4.54572e-06, 3.60001, -4.16853e-05)
+bones/18/rotation = Quaternion(0.507655, 1.75089e-07, 0.0413582, 0.860568)
+bones/19/position = Vector3(5.70967e-07, -7.07246e-06, -9.18487e-06)
+bones/20/rotation = Quaternion(0.413244, -3.11702e-08, 0.0336662, 0.909998)
+bones/21/position = Vector3(-6.99836e-06, -7.14697e-06, -2.1594e-05)
+bones/22/position = Vector3(6.30171e-07, 2.11579, -2.0168e-05)
+bones/23/position = Vector3(2.23517e-06, -3.43425e-06, -5.65971e-06)
+bones/24/position = Vector3(-2.38966e-05, 9.5325, 4.5051e-05)
+bones/24/rotation = Quaternion(0.668999, -0.000171639, 0.0840584, 0.738495)
+bones/25/position = Vector3(-6.4569e-06, 7.69735e-06, 1.93997e-05)
+bones/26/position = Vector3(-1.6476e-05, 3.70001, -1.55696e-05)
+bones/26/rotation = Quaternion(0.496633, -8.3819e-09, 0.0404601, 0.867017)
+bones/27/position = Vector3(-1.2354e-05, -8.65261e-06, -1.28768e-05)
+bones/28/position = Vector3(-4.24592e-06, 2.95001, -9.53893e-06)
+bones/28/rotation = Quaternion(0.411496, 1.23197e-07, 0.033524, 0.910795)
+bones/31/position = Vector3(-7.56234e-07, 7.47032e-06, -1.1809e-05)
+bones/32/rotation = Quaternion(0.665959, -0.0134166, 0.0985026, 0.739335)
+bones/33/position = Vector3(-6.06578e-06, 1.30555e-07, 1.69121e-05)
+bones/34/position = Vector3(-4.23319e-06, 3.37928, 2.18956e-06)
+bones/34/rotation = Quaternion(0.505618, -7.26432e-08, 0.0411921, 0.861774)
+bones/36/position = Vector3(-1.18398e-05, 2.88968, 7.61242e-06)
+bones/36/rotation = Quaternion(0.404281, -1.18074e-07, 0.032936, 0.914042)
+bones/37/position = Vector3(-6.88349e-06, -1.37002e-05, 1.28552e-05)
+bones/38/position = Vector3(2.56333e-07, 2.63883, -1.43249e-05)
+bones/39/position = Vector3(-4.24683e-07, 1.26579e-05, -1.86824e-05)
+bones/40/position = Vector3(2.25984, 9.10828, 0.517869)
+bones/40/rotation = Quaternion(0.664054, 0.0213635, 0.0331529, 0.746644)
+bones/41/position = Vector3(1.06017e-06, 7.42728e-06, 1.53654e-05)
+bones/42/rotation = Quaternion(0.495834, 1.76951e-08, 0.040395, 0.867477)
+bones/43/position = Vector3(-7.02744e-06, 7.93018e-06, 5.25886e-07)
+bones/44/rotation = Quaternion(0.412061, -1.75642e-08, 0.0335699, 0.910538)
+bones/45/position = Vector3(-2.85069e-06, 1.82002e-06, -3.29077e-06)
+bones/48/position = Vector3(2.68185, 2.4648, 1.57399)
+bones/48/rotation = Quaternion(0.269242, 0.0131664, -0.225248, 0.936269)
+bones/49/position = Vector3(-9.0003e-06, -5.24521e-06, 4.05612e-06)
+bones/50/position = Vector3(-1.37213e-05, 4.18898, 1.30866e-06)
+bones/50/rotation = Quaternion(-0.0573431, -0.0228523, 0.23602, 0.969786)
+bones/52/position = Vector3(-1.33398e-07, 3.41628, -7.38503e-06)
+bones/52/rotation = Quaternion(-0.0951258, 0.0335536, -0.103347, 0.989517)
+bones/53/position = Vector3(-1.13845e-05, 6.58631e-06, -2.40871e-06)
+bones/56/rotation = Quaternion(-0.0477065, -0.00417029, 0.0378131, 0.998137)
+bones/57/position = Vector3(-1.43051e-06, -1.90437e-05, -4.97699e-06)
+bones/58/rotation = Quaternion(-0.0436575, 0.0735426, -0.040091, 0.995529)
+bones/59/position = Vector3(3.57626e-07, -2.48402e-05, -4.05312e-06)
+bones/61/rotation = Quaternion(-0.583618, -0.494192, 0.510115, -0.393634)
+bones/62/position = Vector3(-9.28342e-06, -1.90735e-06, -1.25186e-05)
+bones/63/position = Vector3(-6.21295e-06, 10.8377, 3.97934e-05)
+bones/63/rotation = Quaternion(0.347965, 0.00733927, 0.168363, 0.922237)
+bones/64/position = Vector3(-6.81842e-07, 2.49492e-06, -4.24376e-06)
+bones/65/position = Vector3(9.00633e-07, 27.8415, 2.65277e-05)
+bones/65/rotation = Quaternion(-1.72295e-07, -8.69017e-09, 0.856711, 0.515797)
+bones/66/position = Vector3(1.81322e-06, -7.35846e-06, -1.91975e-06)
+bones/67/rotation = Quaternion(-0.00529397, 0.0445442, 0.140527, 0.98906)
+bones/68/position = Vector3(-2.66702e-06, 6.75935e-06, 1.82044e-06)
+bones/69/rotation = Quaternion(0.247973, -0.0477907, 0.214491, 0.943514)
+bones/70/position = Vector3(1.54972e-06, 1.10865e-05, 1.50938e-05)
+bones/71/position = Vector3(-9.48468e-06, 4.18709, 6.46207e-06)
+bones/71/rotation = Quaternion(-0.0402928, 0.0170358, -0.189645, 0.980878)
+bones/72/position = Vector3(4.76837e-06, -6.58631e-06, -1.79932e-05)
+bones/73/position = Vector3(3.41813e-06, 3.41839, -3.61406e-05)
+bones/73/rotation = Quaternion(-0.150634, 0.0196685, -0.0384138, 0.987647)
+bones/74/position = Vector3(6.76513e-06, 4.05312e-06, -9.94626e-07)
+bones/75/position = Vector3(1.19018e-05, 2.58059, -2.38419e-06)
+bones/77/rotation = Quaternion(0.348536, -0.00216019, 0.00770235, 0.937261)
+bones/78/position = Vector3(1.02476e-05, 1.25725e-06, -3.09773e-06)
+bones/79/position = Vector3(1.16544e-05, 3.7, -2.38235e-06)
+bones/79/rotation = Quaternion(0.316306, -4.82716e-07, -0.0324142, 0.948103)
+bones/80/position = Vector3(-4.95017e-06, 2.76518e-06, -1.62069e-05)
+bones/81/rotation = Quaternion(0.316011, -2.94298e-07, -0.0323837, 0.948203)
+bones/84/position = Vector3(2.00886e-06, -1.55707e-05, 1.65336e-05)
+bones/85/rotation = Quaternion(0.3862, -0.00842687, -0.0564331, 0.920648)
+bones/86/position = Vector3(-1.63967e-06, 3.17085e-06, -1.61075e-05)
+bones/87/rotation = Quaternion(0.360214, -3.91738e-07, -0.0369136, 0.932139)
+bones/88/position = Vector3(1.00015e-05, -1.164e-05, -9.66649e-07)
+bones/89/rotation = Quaternion(0.359928, -5.00586e-07, -0.0368843, 0.932251)
+bones/90/position = Vector3(1.66535e-06, -8.3745e-06, -2.99188e-06)
+bones/92/position = Vector3(7.46036e-06, 4.84443e-06, -1.74526e-06)
+bones/93/rotation = Quaternion(0.430639, 0.00721853, -0.0951741, 0.897463)
+bones/94/position = Vector3(8.98751e-07, 5.35152e-06, -6.46659e-07)
+bones/95/rotation = Quaternion(0.410222, -5.0664e-07, -0.0420382, 0.911016)
+bones/96/position = Vector3(4.96211e-06, -1.72045e-06, 3.28761e-06)
+bones/97/position = Vector3(6.86945e-06, 2.95, 1.36588e-05)
+bones/97/rotation = Quaternion(0.408306, -5.79283e-07, -0.0418419, 0.911886)
+bones/98/position = Vector3(-3.15467e-07, 5.01274e-06, 4.26586e-07)
+bones/99/position = Vector3(-2.55906e-05, 2.64431, 3.08781e-07)
+bones/100/position = Vector3(-1.24937e-06, -5.10697e-06, 1.54605e-05)
+bones/101/position = Vector3(3.80626, 8.0778, 0.486897)
+bones/101/rotation = Quaternion(0.453869, -0.00504631, -0.172035, 0.874289)
+bones/102/position = Vector3(-3.4095e-06, 9.84711e-06, 2.19628e-05)
+bones/103/rotation = Quaternion(0.441888, -4.63799e-07, -0.0452826, 0.895927)
+bones/104/position = Vector3(2.55811e-06, 3.79583e-06, -1.0634e-05)
+bones/105/rotation = Quaternion(0.441703, -4.99189e-07, -0.0452642, 0.896019)
+bones/106/position = Vector3(-6.14417e-06, -1.13954e-05, 1.6547e-05)
+bones/107/position = Vector3(-5.6429e-06, 2.12554, -1.44594e-05)
+bones/108/position = Vector3(-9.07481e-06, 9.92674e-06, -5.45842e-07)
+bones/109/rotation = Quaternion(0.00912616, 0.499102, 0.859827, -0.107291)
+bones/110/position = Vector3(-8.46157e-07, 2.16948e-05, -6.41459e-07)
+bones/111/rotation = Quaternion(-0.422236, 0.017693, 0.0133394, 0.906215)
+bones/112/position = Vector3(-6.62415e-08, 3.47755e-06, 3.22101e-06)
+bones/113/rotation = Quaternion(0.540386, -0.024196, -0.0396063, 0.840136)
+bones/115/rotation = Quaternion(0.351334, 3.47398e-05, 1.17676e-05, 0.93625)
+bones/119/rotation = Quaternion(0.102035, 0.0420148, 0.992102, -0.0596471)
+bones/120/position = Vector3(-1.94257e-07, 7.09908e-06, -4.76177e-06)
+bones/121/rotation = Quaternion(-0.339418, 0.0221456, -0.00134624, 0.940374)
+bones/122/position = Vector3(-4.23867e-07, -3.05474e-06, -1.07518e-06)
+bones/123/rotation = Quaternion(0.426336, -0.0330713, -0.134284, 0.89393)
+bones/125/rotation = Quaternion(0.631409, 0.0537683, 0.0373258, 0.772682)
+
 [node name="RightHand" parent="Mesh/AuxScene/Scene/Armature/Skeleton3D" index="2"]
-transform = Transform3D(0.678924, 0.327226, -0.657255, 0.571861, 0.325755, 0.752899, 0.460473, -0.88702, 0.0340353, -5.60212, 89.2255, 32.2557)
+transform = Transform3D(0.339146, 0.643904, -0.685833, 0.44957, 0.529466, 0.71941, 0.826357, -0.552315, -0.109914, -21.7915, 84.1795, 2.81691)
 
 [node name="Node3D" type="Node3D" parent="Mesh/AuxScene/Scene/Armature/Skeleton3D/RightHand" index="0"]
 
@@ -143,12 +275,14 @@ shape = SubResource("CapsuleShape3D_1kx10")
 [node name="Input" type="Node3D" parent="."]
 script = ExtResource("3_x6527")
 min_range = 0.5
+metadata/_custom_type_script = "uid://ny0p0jkmlrv8"
 
 [node name="Interactor" type="Area3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1.5, 1)
 input_ray_pickable = false
 script = ExtResource("5_uk7c1")
 _root_node = NodePath("..")
+metadata/_custom_type_script = "uid://kjthk4tj8qof"
 
 [node name="CollisionShape3D" type="CollisionShape3D" parent="Interactor"]
 shape = SubResource("SphereShape3D_64co4")
@@ -177,4 +311,8 @@ metadata/_custom_type_script = "uid://dkvbawcldnok5"
 [node name="FireRate" type="Timer" parent="EquippedWeapon"]
 one_shot = true
 
+[node name="Health" type="Node" parent="."]
+script = ExtResource("8_smehm")
+metadata/_custom_type_script = "uid://bccrrtp3mlw5i"
+
 [editable path="Mesh"]
diff --git a/src/input_buffer.ts b/src/collection/input_buffer.ts
similarity index 100%
rename from src/input_buffer.ts
rename to src/collection/input_buffer.ts
diff --git a/src/input_buffer.ts.uid b/src/collection/input_buffer.ts.uid
similarity index 100%
rename from src/input_buffer.ts.uid
rename to src/collection/input_buffer.ts.uid
diff --git a/src/damage_source.ts b/src/damage_source.ts
index 50b9770..7fbf55d 100644
--- a/src/damage_source.ts
+++ b/src/damage_source.ts
@@ -1,5 +1,5 @@
-import { float64, Node, Node3D, NodePath, PackedStringArray, Variant } from 'godot'
-import { Damageable } from './health'
+import { float64, Node, Node3D, NodePath, Variant } from 'godot'
+import { Damageable } from './entity/health'
 import { export_ } from 'godot.annotations'
 
 export default class DamageSource extends Node3D {
diff --git a/src/equipped_weapon.ts b/src/entity/equipped_weapon.ts
similarity index 81%
rename from src/equipped_weapon.ts
rename to src/entity/equipped_weapon.ts
index 380a5aa..458fc5e 100644
--- a/src/equipped_weapon.ts
+++ b/src/entity/equipped_weapon.ts
@@ -1,11 +1,11 @@
-import { Color, GArray, Node, Node3D, PackedScene, PackedStringArray, PhysicsBody3D, PhysicsRayQueryParameters3D, Signal1, Timer, Vector3 } from 'godot'
+import { Color, GArray, Node, Node3D, PackedScene, PhysicsBody3D, PhysicsRayQueryParameters3D, Signal1, Timer, Vector3 } from 'godot'
 import { export_file, signal } from 'godot.annotations'
-import { export_node, onready } from './annotations'
-import Weapon from './weapon'
-import AsyncResourceHandler from './async_resource_handler'
-import { forward } from './vec'
-import DebugDraw from './debug_draw'
-import { find_in_anscestors, find_in_descendents, has_method } from './node'
+import { export_node, onready } from '../extension/annotations'
+import Weapon from '../item/weapon'
+import AsyncResourceHandler from '../global/async_resource_handler'
+import { forward } from '../extension/vec'
+import DebugDraw from '../global/debug_draw'
+import { find_in_ancestors, find_in_descendents, has_method } from '../extension/node'
 import { Damageable } from './health'
 
 const { MULTIPLY: mul, ADD: add } = Vector3
@@ -85,7 +85,7 @@ export default class EquippedWeapon extends Node3D {
 
       if (!result.is_empty()) {
         DebugDraw.draw_ray(query, Color.DARK_RED)
-        const root = find_in_anscestors(result.get('collider'), n => n instanceof PhysicsBody3D)
+        const root = find_in_ancestors(result.get('collider'), n => n instanceof PhysicsBody3D)
         const health = find_in_descendents<Node & Damageable>(root, n => has_method('apply_damage', n))
         if (health != null) {
           health.apply_damage(this, this._equipped_weapon.damage)
diff --git a/src/equipped_weapon.ts.uid b/src/entity/equipped_weapon.ts.uid
similarity index 100%
rename from src/equipped_weapon.ts.uid
rename to src/entity/equipped_weapon.ts.uid
diff --git a/src/health.ts b/src/entity/health.ts
similarity index 85%
rename from src/health.ts
rename to src/entity/health.ts
index b47c086..ee6e581 100644
--- a/src/health.ts
+++ b/src/entity/health.ts
@@ -16,6 +16,14 @@ export default class Health extends Node implements Damageable, Recoverable {
   @export_(Variant.Type.TYPE_FLOAT)
   private _current_health: number = 0
 
+  get current_health() {
+    return this._current_health
+  }
+
+  set current_health(value: number) {
+    this._current_health = value
+  }
+
   _ready() {
     this._current_health = this._max_health
   }
diff --git a/src/health.ts.uid b/src/entity/health.ts.uid
similarity index 100%
rename from src/health.ts.uid
rename to src/entity/health.ts.uid
diff --git a/src/interactor.ts b/src/entity/interactor.ts
similarity index 96%
rename from src/interactor.ts
rename to src/entity/interactor.ts
index 767047b..75a78b5 100644
--- a/src/interactor.ts
+++ b/src/entity/interactor.ts
@@ -1,6 +1,6 @@
 import { Area3D, Callable, Node, NodePath, Variant } from 'godot'
-import Interactable from './interactable'
 import { export_ } from 'godot.annotations'
+import Interactable from '../interactable/interactable'
 
 class InteractableDistance {
   static Empty = new InteractableDistance(Infinity)
diff --git a/src/interactor.ts.uid b/src/entity/interactor.ts.uid
similarity index 100%
rename from src/interactor.ts.uid
rename to src/entity/interactor.ts.uid
diff --git a/src/inventory.ts b/src/entity/inventory.ts
similarity index 79%
rename from src/inventory.ts
rename to src/entity/inventory.ts
index 704aa71..38c8502 100644
--- a/src/inventory.ts
+++ b/src/entity/inventory.ts
@@ -1,11 +1,9 @@
 import { clampi, Node, StringName } from 'godot'
-import ItemData from './item'
-import { GArrayEnumerator } from './collection/enumerable'
-import { Enumerable } from '../addons/enumerable-ts/src/index'
-import { find_in_descendents } from './node'
+import Item from '../item/item'
+import { find_in_descendents } from '../extension/node'
 
 class ItemInstance {
-  readonly resource: ItemData
+  readonly resource: Item
 
   get name() {
     return this.resource.name
@@ -17,7 +15,7 @@ class ItemInstance {
 
   quantity: number
 
-  constructor(resource: ItemData, quantity: number = 1) {
+  constructor(resource: Item, quantity: number = 1) {
     this.resource = resource
     this.quantity = quantity
   }
@@ -58,7 +56,7 @@ export default class Inventory extends Node {
     return inventory
   }
 
-  add(item: ItemData, quantity: number = 1) {
+  add(item: Item, quantity: number = 1) {
     const existing_item = this.items.get(item.name)
 
     if (!existing_item) {
@@ -68,7 +66,7 @@ export default class Inventory extends Node {
     }
   }
 
-  has(item: ItemData): boolean {
+  has(item: Item): boolean {
     return this.items.has(item.name)
   }
 }
diff --git a/src/inventory.ts.uid b/src/entity/inventory.ts.uid
similarity index 100%
rename from src/inventory.ts.uid
rename to src/entity/inventory.ts.uid
diff --git a/src/player.ts b/src/entity/player.ts
similarity index 85%
rename from src/player.ts
rename to src/entity/player.ts
index f3b3158..e671516 100644
--- a/src/player.ts
+++ b/src/entity/player.ts
@@ -1,12 +1,16 @@
 import { Callable, Callable0, Callable1, CharacterBody3D, Color, float64, ProjectSettings, Variant, Vector2, Vector3 } from 'godot'
 import { export_, help, onready } from 'godot.annotations'
 import PlayerInput from './player_input'
-import DebugDraw from './debug_draw'
+import DebugDraw from '../global/debug_draw'
 import Interactor from './interactor'
+import Health from './health'
 import PlayerAnimation, { PlayerAnimationName } from './player_animation'
 import EquippedWeapon from './equipped_weapon'
+import GameState, { Savable } from '../save_system/game_state'
+import PlayerState from '../save_system/player_state'
+import SaveState from '../save_system/save_state'
 
-export default class Player extends CharacterBody3D {
+export default class Player extends CharacterBody3D implements Savable {
   readonly gravity = ProjectSettings.get_setting('physics/3d/default_gravity')
 
   @onready('Input')
@@ -18,6 +22,9 @@ export default class Player extends CharacterBody3D {
   @onready('Interactor')
   readonly interactor!: Interactor
 
+  @onready('Health')
+  readonly health!: Health
+
   @onready('EquippedWeapon')
   readonly equipped_weapon!: EquippedWeapon
 
@@ -109,6 +116,25 @@ export default class Player extends CharacterBody3D {
     this.player_animation.animation_finished.connect(this._enable_action_callable)
   }
 
+  on_save_game(save_data: GameState): void {
+    const state = new PlayerState()
+    state.position = this.global_position
+    state.condition = 100
+    state.scene = this.scene_file_path
+    save_data.world.push(state)
+  }
+
+  on_before_load_game?(): void {
+    this.get_parent().remove_child(this)
+    this.queue_free()
+  }
+
+  on_load_game<T extends SaveState>(state: T): void {
+    const player_state = state as unknown as PlayerState
+    this.global_position = player_state.position
+    this.health.current_health = player_state.condition
+  }
+
   private _disable_action(value: string) {
     if (PlayerAnimationName.Fire === value) {
       this._can_act = false
diff --git a/src/player.ts.uid b/src/entity/player.ts.uid
similarity index 100%
rename from src/player.ts.uid
rename to src/entity/player.ts.uid
diff --git a/src/player_animation.ts b/src/entity/player_animation.ts
similarity index 96%
rename from src/player_animation.ts
rename to src/entity/player_animation.ts
index b3e7f10..1bbd910 100644
--- a/src/player_animation.ts
+++ b/src/entity/player_animation.ts
@@ -1,7 +1,7 @@
 import { AnimationTree, Expression, float64, GArray, GError, Node } from 'godot'
 import Player from './player'
 import PlayerInput from './player_input'
-import { export_expression, onready } from './annotations'
+import { export_expression, onready } from '../extension/annotations'
 
 export const PlayerAnimationName = Object.freeze({
   Idle: 'Idle',
diff --git a/src/player_animation.ts.uid b/src/entity/player_animation.ts.uid
similarity index 100%
rename from src/player_animation.ts.uid
rename to src/entity/player_animation.ts.uid
diff --git a/src/player_input.ts b/src/entity/player_input.ts
similarity index 98%
rename from src/player_input.ts
rename to src/entity/player_input.ts
index 5b95a63..b1d759b 100644
--- a/src/player_input.ts
+++ b/src/entity/player_input.ts
@@ -1,8 +1,8 @@
 import { Callable, Callable1, Camera3D, float64, Input, InputEvent, InputEventJoypadButton, InputEventJoypadMotion, InputEventKey, InputEventMouse, InputEventMouseMotion, int32, Node3D, PhysicsRayQueryParameters3D, Signal0, Signal1, Variant, Vector2, Vector3, World3D } from 'godot'
 import { export_, signal } from 'godot.annotations'
-import InputBuffer from './input_buffer'
-import MainCamera from './main_camera'
-import MessageBus from './message_bus'
+import InputBuffer from '../collection/input_buffer'
+import MainCamera from '../main_camera'
+import MessageBus from '../global/message_bus'
 
 export const PlayerMovement = Object.freeze({
   MoveLeft: 'move_left',
diff --git a/src/player_input.ts.uid b/src/entity/player_input.ts.uid
similarity index 100%
rename from src/player_input.ts.uid
rename to src/entity/player_input.ts.uid
diff --git a/src/annotations.ts b/src/extension/annotations.ts
similarity index 100%
rename from src/annotations.ts
rename to src/extension/annotations.ts
diff --git a/src/annotations.ts.uid b/src/extension/annotations.ts.uid
similarity index 100%
rename from src/annotations.ts.uid
rename to src/extension/annotations.ts.uid
diff --git a/src/godot_error.ts b/src/extension/godot_error.ts
similarity index 84%
rename from src/godot_error.ts
rename to src/extension/godot_error.ts
index d11fe1e..6ad94db 100644
--- a/src/godot_error.ts
+++ b/src/extension/godot_error.ts
@@ -1,4 +1,4 @@
-import { GError } from "godot";
+import { GError } from 'godot'
 
 export class GodotError extends Error {
   error: GError
diff --git a/src/godot_error.ts.uid b/src/extension/godot_error.ts.uid
similarity index 100%
rename from src/godot_error.ts.uid
rename to src/extension/godot_error.ts.uid
diff --git a/src/node.ts b/src/extension/node.ts
similarity index 58%
rename from src/node.ts
rename to src/extension/node.ts
index aa500bb..bcbb081 100644
--- a/src/node.ts
+++ b/src/extension/node.ts
@@ -11,17 +11,24 @@ export function queue_free_children<T extends Node>(node: T) {
   }
 }
 
-type RequiredField<T, Field extends keyof T> = Omit<T, Field> & Required<Pick<T, Field>>
+type RequiredField<T, Key extends keyof T> = Omit<T, Key> & Required<Pick<T, Key>>;
 
-export function has_method(name: StringName, obj: Object): boolean {
-  return obj.has_method(name)
+export function has_methods<T extends Object & {}, U extends [keyof T, ...Array<keyof T>]>(
+  keys: U,
+  obj: T
+): obj is Object & RequiredField<T, U[number]> {
+  return keys.every(key => obj.has_method(key as string))
+}
+
+export function has_method<T extends Object & {}>(name: StringName, obj: Object): obj is Object & RequiredField<T, keyof T> {
+  return has_methods([name as keyof Object], obj)
 }
 
 export function implements_interface<T>(method_names: StringName[], obj: Object): obj is Object & T {
   return method_names.every(name => has_method(name, obj))
 }
 
-export function find_in_anscestors<T extends Node>(root: T | null | undefined, predicate: Predicate<Node>, height: number = Infinity): T | null | undefined {
+export function find_in_ancestors<T extends Node>(root: T | null | undefined, predicate: Predicate<Node>, height: number = Infinity): T | null | undefined {
   if (height < 0 || root == null) {
     return
   }
@@ -30,7 +37,7 @@ export function find_in_anscestors<T extends Node>(root: T | null | undefined, p
     return root
   }
 
-  return find_in_anscestors(root.get_parent(), predicate, height - 1) as T
+  return find_in_ancestors(root.get_parent(), predicate, height - 1) as T
 }
 
 export function find_in_descendents<T extends Node>(root: T, predicate: Predicate<Node>, depth: number = Infinity): T | null | undefined {
diff --git a/src/node.ts.uid b/src/extension/node.ts.uid
similarity index 100%
rename from src/node.ts.uid
rename to src/extension/node.ts.uid
diff --git a/src/vec.ts b/src/extension/vec.ts
similarity index 100%
rename from src/vec.ts
rename to src/extension/vec.ts
diff --git a/src/vec.ts.uid b/src/extension/vec.ts.uid
similarity index 100%
rename from src/vec.ts.uid
rename to src/extension/vec.ts.uid
diff --git a/src/async_resource_handler.ts b/src/global/async_resource_handler.ts
similarity index 90%
rename from src/async_resource_handler.ts
rename to src/global/async_resource_handler.ts
index 64c4142..42921b5 100644
--- a/src/async_resource_handler.ts
+++ b/src/global/async_resource_handler.ts
@@ -1,5 +1,5 @@
 import { GArray, GError, Node, Resource, ResourceLoader, ResourceSaver } from 'godot'
-import { GodotError } from './godot_error'
+import { GodotError } from '../extension/godot_error'
 
 export class ResourceLoadError extends Error { }
 
@@ -16,11 +16,11 @@ export default class AsyncResourceHandler extends Node {
     AsyncResourceHandler._instance = this
   }
 
-  static save<T extends Resource>(path: string, data: T, flags: ResourceSaver.SaverFlags): Promise<void> {
+  static save<T extends Resource>(path: string, data: T, flags?: ResourceSaver.SaverFlags): Promise<void> {
     return this._instance.save(path, data, flags)
   }
 
-  save<T extends Resource>(path: string, data: T, flags: ResourceSaver.SaverFlags): Promise<void> {
+  save<T extends Resource>(path: string, data: T, flags: ResourceSaver.SaverFlags = ResourceSaver.SaverFlags.FLAG_NONE): Promise<void> {
     return new Promise((resolve, reject) => {
       const err = ResourceSaver.save(data, path, flags)
 
diff --git a/src/async_resource_handler.ts.uid b/src/global/async_resource_handler.ts.uid
similarity index 100%
rename from src/async_resource_handler.ts.uid
rename to src/global/async_resource_handler.ts.uid
diff --git a/src/async_resource_loader.ts.uid b/src/global/async_resource_loader.ts.uid
similarity index 100%
rename from src/async_resource_loader.ts.uid
rename to src/global/async_resource_loader.ts.uid
diff --git a/src/debug_draw.ts b/src/global/debug_draw.ts
similarity index 100%
rename from src/debug_draw.ts
rename to src/global/debug_draw.ts
diff --git a/src/debug_draw.ts.uid b/src/global/debug_draw.ts.uid
similarity index 100%
rename from src/debug_draw.ts.uid
rename to src/global/debug_draw.ts.uid
diff --git a/src/message_bus.ts b/src/global/message_bus.ts
similarity index 100%
rename from src/message_bus.ts
rename to src/global/message_bus.ts
diff --git a/src/message_bus.ts.uid b/src/global/message_bus.ts.uid
similarity index 100%
rename from src/message_bus.ts.uid
rename to src/global/message_bus.ts.uid
diff --git a/src/interactable/door.ts b/src/interactable/door.ts
index 87a4d05..8ba75ca 100644
--- a/src/interactable/door.ts
+++ b/src/interactable/door.ts
@@ -1,8 +1,8 @@
 import { Node3D, Variant } from 'godot'
 import { export_ } from 'godot.annotations'
-import Interactor from '../interactor'
-import Item from '../item'
-import Inventory from '../inventory'
+import Interactor from '../entity/interactor'
+import Item from '../item/item'
+import Inventory from '../entity/inventory'
 
 export default class Door extends Node3D {
 	@export_(Variant.Type.TYPE_BOOL)
diff --git a/src/interactable.ts b/src/interactable/interactable.ts
similarity index 85%
rename from src/interactable.ts
rename to src/interactable/interactable.ts
index bc59001..e5308b0 100644
--- a/src/interactable.ts
+++ b/src/interactable/interactable.ts
@@ -1,5 +1,5 @@
 import { Area3D, Signal1 } from 'godot'
-import Interactor from './interactor'
+import Interactor from '../entity/interactor'
 import { signal } from 'godot.annotations'
 
 export default class Interactable extends Area3D {
diff --git a/src/interactable.ts.uid b/src/interactable/interactable.ts.uid
similarity index 100%
rename from src/interactable.ts.uid
rename to src/interactable/interactable.ts.uid
diff --git a/src/item.ts b/src/item.ts
deleted file mode 100644
index 04c216b..0000000
--- a/src/item.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import { Resource, StringName, Variant } from 'godot'
-import { export_, export_enum, export_multiline } from 'godot.annotations'
-
-export type ItemType = number
-
-export default class Item extends Resource {
-  @export_(Variant.Type.TYPE_STRING_NAME)
-  readonly name: StringName = ''
-
-  @export_multiline()
-  readonly description: string = ''
-
-  @export_(Variant.Type.TYPE_INT)
-  readonly max_quantity: number = 99
-}
-
diff --git a/src/item_data.ts b/src/item/item.ts
similarity index 100%
rename from src/item_data.ts
rename to src/item/item.ts
diff --git a/src/item.ts.uid b/src/item/item.ts.uid
similarity index 100%
rename from src/item.ts.uid
rename to src/item/item.ts.uid
diff --git a/src/item_pickup.ts b/src/item/item_pickup.ts
similarity index 87%
rename from src/item_pickup.ts
rename to src/item/item_pickup.ts
index 437766e..c78a189 100644
--- a/src/item_pickup.ts
+++ b/src/item/item_pickup.ts
@@ -1,8 +1,8 @@
 import { Node, Variant } from 'godot'
 import { export_, export_range } from 'godot.annotations'
 import ItemData from './item'
-import Interactor from './interactor'
-import Inventory from './inventory'
+import Interactor from '../entity/interactor'
+import Inventory from '../entity/inventory'
 
 export default class ItemPickup extends Node {
   @export_(Variant.Type.TYPE_OBJECT, { class_: ItemData })
diff --git a/src/item_pickup.ts.uid b/src/item/item_pickup.ts.uid
similarity index 100%
rename from src/item_pickup.ts.uid
rename to src/item/item_pickup.ts.uid
diff --git a/src/weapon.ts b/src/item/weapon.ts
similarity index 83%
rename from src/weapon.ts
rename to src/item/weapon.ts
index 1fd5866..795cd27 100644
--- a/src/weapon.ts
+++ b/src/item/weapon.ts
@@ -1,5 +1,5 @@
 import { Variant } from 'godot'
-import { export_scene } from './annotations'
+import { export_scene } from '../extension/annotations'
 import Item from './item'
 import { export_ } from 'godot.annotations'
 
@@ -11,7 +11,7 @@ export default class Weapon extends Item {
 	readonly damage: number = 1
 
 	@export_(Variant.Type.TYPE_FLOAT)
-	readonly range: number = 100
+	readonly range: number = 25
 
 	@export_(Variant.Type.TYPE_FLOAT)
 	readonly fire_rate!: number
diff --git a/src/weapon.ts.uid b/src/item/weapon.ts.uid
similarity index 100%
rename from src/weapon.ts.uid
rename to src/item/weapon.ts.uid
diff --git a/src/item_data.ts.uid b/src/item_data.ts.uid
deleted file mode 100644
index 0b8866b..0000000
--- a/src/item_data.ts.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://cglbkbhvgksc
diff --git a/src/main_camera.ts b/src/main_camera.ts
index 852db6f..473e709 100644
--- a/src/main_camera.ts
+++ b/src/main_camera.ts
@@ -1,5 +1,5 @@
 import { Camera3D } from 'godot'
-import MessageBus from './message_bus'
+import MessageBus from './global/message_bus'
 
 export default class MainCamera extends Camera3D {
   private static _instance: MainCamera
diff --git a/src/resource_loader.ts b/src/resource_loader.ts
deleted file mode 100644
index 1b521af..0000000
--- a/src/resource_loader.ts
+++ /dev/null
@@ -1,38 +0,0 @@
-import { GError, Node, Resource, ResourceLoader } from 'godot'
-
-export default class AsyncResourceLoader extends Node {
-  private static _instance: AsyncResourceLoader
-
-  static get instance() {
-    return this._instance
-  }
-
-  _ready(): void {
-    AsyncResourceLoader._instance = this
-  }
-
-  load<T extends Resource>(path: string, hint_string: string = ''): Promise<T> {
-    return new Promise(async (resolve, reject) => {
-      const err = ResourceLoader.load_threaded_request(path, hint_string)
-
-      if (err != GError.OK) {
-        return reject(new Error(`failed to load ${path}`))
-      }
-
-      const get_status = () => ResourceLoader.load_threaded_get_status(path)
-
-      let status = get_status()
-      while (status === ResourceLoader.ThreadLoadStatus.THREAD_LOAD_IN_PROGRESS) {
-        await this.get_tree().process_frame.as_promise()
-        status = get_status()
-      }
-
-      if (get_status() === ResourceLoader.ThreadLoadStatus.THREAD_LOAD_LOADED) {
-        return resolve(ResourceLoader.load_threaded_get(path) as T)
-      } else {
-        return reject(new Error(`failed to load ${path}`))
-      }
-    })
-  }
-}
-
diff --git a/src/resource_loader.ts.uid b/src/resource_loader.ts.uid
deleted file mode 100644
index c95ef98..0000000
--- a/src/resource_loader.ts.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://dhl3jsf2be316
diff --git a/src/save_serializer.ts b/src/save_serializer.ts
deleted file mode 100644
index 4608478..0000000
--- a/src/save_serializer.ts
+++ /dev/null
@@ -1,87 +0,0 @@
-import { GDictionary, Node, PackedScene, Resource, ResourceLoader, ResourceSaver } from 'godot'
-import AsyncResourceHandler from './async_resource_handler'
-import { has_method } from './node'
-
-interface Serializable {
-  on_save_game(save_data: GameState): void
-  on_before_load_game?(): void
-  on_load_game<T extends SaveState>(state: T): void
-}
-
-interface SaveState extends Resource {
-  scene: string
-}
-
-class PlayerState extends Resource implements SaveState {
-  condition: undefined = undefined
-  inventory: undefined = undefined
-  scene: string = ''
-}
-
-class ProgressState extends Resource {
-  variables?: GDictionary
-}
-
-export class GameState extends Resource {
-  player?: PlayerState
-  progress?: ProgressState
-  world?: SaveState[]
-}
-
-const StateMethod = {
-  Save: 'on_save_game',
-  BeforeLoad: 'on_before_load_game',
-  Load: 'on_load_game'
-} as const
-
-type StateMethod = typeof StateMethod[keyof typeof StateMethod]
-
-export default class SaveSerializer extends Node {
-  private static _save_group: string = 'save'
-
-  private static _instance: SaveSerializer
-
-  _ready() {
-    SaveSerializer._instance = this
-  }
-
-  static save() {
-    this._instance.save()
-  }
-
-  private _announce(method: StateMethod, ...args: any) {
-    this.get_tree().call_group(
-      SaveSerializer._save_group,
-      method,
-      ...args
-    )
-  }
-
-  save() {
-    const game_state: GameState = new GameState()
-
-    this._announce(StateMethod.Save, game_state)
-
-    ResourceSaver.save(game_state, 'user://save1.tres')
-  }
-
-  private async _restore_node<T extends SaveState>(state: T, parent: Node) {
-    const scene: PackedScene = await AsyncResourceHandler.load(state.scene, 'PackedScene')
-    const node = scene.instantiate()
-    parent.add_child(node)
-
-    if (has_method(StateMethod.Load, node)) {
-      // TODO: type check for state method
-    }
-
-  }
-
-  async load() {
-    const loaded_state: GameState = await AsyncResourceHandler.load('user://save1.tres')
-    this._announce(StateMethod.BeforeLoad)
-    // TODO: pass world root as 2nd param
-    const node_promises = loaded_state.world?.map(state => this._restore_node(state, this)) ?? []
-    return Promise.all(node_promises)
-  }
-}
-
diff --git a/src/save_system/game_state.ts b/src/save_system/game_state.ts
new file mode 100644
index 0000000..7d49474
--- /dev/null
+++ b/src/save_system/game_state.ts
@@ -0,0 +1,19 @@
+import { GArray, PropertyHint, Resource, Variant } from 'godot'
+import SaveState from './save_state'
+import ProgressState from './progress_state'
+import { export_, export_array, export_object } from 'godot.annotations'
+
+export default class GameState extends Resource {
+  //@export_object(ProgressState)
+  //progress: ProgressState = new ProgressState()
+
+  @export_(Variant.Type.TYPE_ARRAY, { class_: SaveState, hint: PropertyHint.PROPERTY_HINT_RESOURCE_TYPE })
+  world: SaveState[] = []
+}
+
+export interface Savable {
+  on_save_game(save_data: GameState): void
+  on_before_load_game?(): void
+  on_load_game<T extends SaveState>(state: T): void
+}
+
diff --git a/src/save_system/game_state.ts.uid b/src/save_system/game_state.ts.uid
new file mode 100644
index 0000000..9b94056
--- /dev/null
+++ b/src/save_system/game_state.ts.uid
@@ -0,0 +1 @@
+uid://c0c2ne0y277od
diff --git a/src/save_system/item_state.ts b/src/save_system/item_state.ts
new file mode 100644
index 0000000..84dd6b9
--- /dev/null
+++ b/src/save_system/item_state.ts
@@ -0,0 +1,12 @@
+import { Resource, Variant } from 'godot'
+import Item from '../item/item'
+import { export_, export_object } from 'godot.annotations'
+
+export default class ItemState extends Resource {
+  @export_object(Item)
+  item?: Item
+
+  @export_(Variant.Type.TYPE_INT)
+  quantity?: number
+}
+
diff --git a/src/save_system/item_state.ts.uid b/src/save_system/item_state.ts.uid
new file mode 100644
index 0000000..9c5dda7
--- /dev/null
+++ b/src/save_system/item_state.ts.uid
@@ -0,0 +1 @@
+uid://monf53dokbkn
diff --git a/src/save_system/player_state.ts b/src/save_system/player_state.ts
new file mode 100644
index 0000000..31beebc
--- /dev/null
+++ b/src/save_system/player_state.ts
@@ -0,0 +1,19 @@
+import { Resource, Variant, Vector3 } from 'godot'
+import SaveState from './save_state'
+import ItemState from './item_state'
+import { export_, export_array } from 'godot.annotations'
+
+export default class PlayerState extends Resource implements SaveState {
+  @export_(Variant.Type.TYPE_VECTOR3)
+  position!: Vector3
+
+  @export_(Variant.Type.TYPE_FLOAT)
+  condition!: number
+
+  //@export_array(ItemState)
+  //inventory: ItemState[] = []
+
+  @export_(Variant.Type.TYPE_STRING_NAME)
+  scene!: string
+}
+
diff --git a/src/save_system/player_state.ts.uid b/src/save_system/player_state.ts.uid
new file mode 100644
index 0000000..1f804ae
--- /dev/null
+++ b/src/save_system/player_state.ts.uid
@@ -0,0 +1 @@
+uid://sgqrfg7r58fl
diff --git a/src/save_system/progress_state.ts b/src/save_system/progress_state.ts
new file mode 100644
index 0000000..0fc890c
--- /dev/null
+++ b/src/save_system/progress_state.ts
@@ -0,0 +1,4 @@
+export default class ProgressState {
+  variables: Map<string, any> = new Map()
+}
+
diff --git a/src/save_system/progress_state.ts.uid b/src/save_system/progress_state.ts.uid
new file mode 100644
index 0000000..fd93b73
--- /dev/null
+++ b/src/save_system/progress_state.ts.uid
@@ -0,0 +1 @@
+uid://dbvn54hy25am5
diff --git a/src/save_system/save_serializer.ts b/src/save_system/save_serializer.ts
new file mode 100644
index 0000000..2eddd0c
--- /dev/null
+++ b/src/save_system/save_serializer.ts
@@ -0,0 +1,91 @@
+import { FileAccess, GArray, Node, PackedScene } from 'godot'
+import AsyncResourceHandler from '../global/async_resource_handler'
+import { implements_interface } from '../extension/node'
+import GameState, { Savable } from './game_state'
+import SaveState from './save_state'
+import { Enumerable } from '../../addons/enumerable-ts/src'
+import { GArrayEnumerator } from '../collection/enumerable'
+
+interface FileHandler {
+  (file: FileAccess): void
+}
+
+const open = (path: string, mode: FileAccess.ModeFlags, fn: FileHandler) => {
+  const fd = FileAccess.open(path, mode)
+  const result = fn(fd)
+  fd.flush()
+  fd.close()
+  return result
+}
+
+const read = (path: string, handler: FileHandler) => open(path, FileAccess.ModeFlags.READ, handler)
+
+const write = (path: string, handler: FileHandler) => open(path, FileAccess.ModeFlags.WRITE, handler)
+
+const StateMethod = {
+  Save: 'on_save_game',
+  BeforeLoad: 'on_before_load_game',
+  Load: 'on_load_game'
+} as const
+
+type StateMethod = typeof StateMethod[keyof typeof StateMethod]
+
+export default class SaveSerializer extends Node {
+  private static _save_group: string = 'save'
+
+  private static _instance: SaveSerializer
+
+  _ready() {
+    SaveSerializer._instance = this
+    this.save()
+    this.load(this)
+  }
+
+  static save() {
+    this._instance.save()
+  }
+
+  private _announce(method: StateMethod, ...args: any) {
+    this.get_tree().call_group(
+      SaveSerializer._save_group,
+      method,
+      ...args
+    )
+  }
+
+  save() {
+    write('user://save1.save', file => {
+      const game_state = new GameState()
+      this._announce(StateMethod.Save, game_state)
+      //const json = JSON.stringify(game_state)
+      file.store_var(game_state)
+    })
+  }
+
+  private async _restore_node<T extends SaveState>(state: T, parent: Node) {
+    const scene: PackedScene = await AsyncResourceHandler.load(state.scene, 'PackedScene')
+    const node = scene.instantiate()
+    parent.add_child(node)
+
+    if (implements_interface<Savable>(Object.values(StateMethod), node)) {
+      node.on_load_game(state)
+    }
+  }
+
+  async load(world_root: Node) {
+    read('user://save1.save', file => {
+      //const state = JSON.parse(file.get_line()) as GameState
+      const state = file.get_var() as GameState
+      console.log(state)
+      this._announce(StateMethod.BeforeLoad)
+      const promises = []
+
+      for (const obj of state.world) {
+        promises.push(this._restore_node(obj, world_root))
+      }
+
+      return Promise.all(promises)
+    })
+  }
+}
+
diff --git a/src/save_serializer.ts.uid b/src/save_system/save_serializer.ts.uid
similarity index 100%
rename from src/save_serializer.ts.uid
rename to src/save_system/save_serializer.ts.uid
diff --git a/src/save_system/save_state.ts b/src/save_system/save_state.ts
new file mode 100644
index 0000000..668812b
--- /dev/null
+++ b/src/save_system/save_state.ts
@@ -0,0 +1,4 @@
+export default class SaveState {
+  scene!: string
+}
+
diff --git a/src/save_system/save_state.ts.uid b/src/save_system/save_state.ts.uid
new file mode 100644
index 0000000..056597a
--- /dev/null
+++ b/src/save_system/save_state.ts.uid
@@ -0,0 +1 @@
+uid://y7hjjte8tykg
diff --git a/typings/scenes/node_3d.nodes.gen.d.ts b/typings/scenes/node_3d.nodes.gen.d.ts
index faa7911..7099e6f 100644
--- a/typings/scenes/node_3d.nodes.gen.d.ts
+++ b/typings/scenes/node_3d.nodes.gen.d.ts
@@ -58,6 +58,7 @@ declare module "godot" {
                             FireRate: Timer<{}>,
                         }
                     >,
+                    Health: Node<{}>,
                 }
             >,
             DirectionalLight3D: DirectionalLight3D<{}>,
diff --git a/typings/scenes/player.nodes.gen.d.ts b/typings/scenes/player.nodes.gen.d.ts
index 1505286..ad66f32 100644
--- a/typings/scenes/player.nodes.gen.d.ts
+++ b/typings/scenes/player.nodes.gen.d.ts
@@ -43,6 +43,7 @@ declare module "godot" {
                     FireRate: Timer<{}>,
                 }
             >,
+            Health: Node<{}>,
         },
     }
 }