Mark the input as handled once proceed

May optimize engine flow.

Player.gd

@@ -57,8 +57,10 @@ func _unhandled_input(event):
 	if event.is_pressed():
 		if event.is_action(turn_left_action):
 			dire_delta = -1
+			get_tree().set_input_as_handled()
 		elif event.is_action(turn_right_action):
 			dire_delta = 1
+			get_tree().set_input_as_handled()
 
 func _on_game_start():
 	move()