Add collectable types and implement level unlocking mechanics; enhance player state management

scripts/components/exit_door_component.gd

@@ -0,0 +1,34 @@
+class_name ExitDoorComponent
+extends Node
+
+@export var locked: bool = true
+@export var exit_area: Area2D
+@export var door_sprite: Sprite2D
+@export var opened_door_sfx: AudioStreamPlayer2D
+@export var opened_door_frame: int = 0
+signal exit_triggered
+@onready var gm: GM = $"/root/GameManager"
+
+
+func _ready() -> void:
+	if not exit_area:
+		printerr("ExitDoorComponent: exit_area is not set.")
+		return
+
+	exit_area.body_entered.connect(on_exit_area_body_entered)
+
+
+func unlock() -> void:
+	locked = false
+	if door_sprite:
+		door_sprite.frame = opened_door_frame
+	if opened_door_sfx:
+		opened_door_sfx.play()
+
+
+func on_exit_area_body_entered(_body: Node2D) -> void:
+	if locked:
+		return
+
+	exit_triggered.emit()
+	gm.try_to_go_to_next_level()