feat: add puzzleButton node; add logic and collisions to it;

Scenes/PuzzleButton/puzzle_button.gd

@@ -0,0 +1,24 @@
+extends Area2D
+var bodies_on_top = 0
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass
+ 
+
+func _on_body_entered(body: Node2D) -> void:
+	bodies_on_top = bodies_on_top + 1
+	if (body.is_in_group("pushable") or body is Player) and bodies_on_top == 1:
+		$AnimatedSprite2D.play("pressed")
+		print("PRESSED!")
+
+
+func _on_body_exited(body: Node2D) -> void:
+	bodies_on_top = bodies_on_top - 1
+	if (body.is_in_group("pushable") or body is Player) and bodies_on_top == 0:
+		$AnimatedSprite2D.play("unpressed")
+		print("UNPRESSED!")