added sound test

menus/back_button.gd

@@ -0,0 +1,15 @@
+extends TextureButton
+
+export var next_scene: PackedScene
+onready var sprite = $AnimatedSprite
+
+func _process(delta):
+	if has_focus():
+		sprite.playing = true
+	else:
+		sprite.playing = false
+		sprite.frame = 0
+
+func _gui_input(event):
+	if event.is_action_pressed("ui_accept"):
+		SceneManager.current_scene = next_scene.instance()