var velocity = Vector2.ZERO

func _physics_process(delta):
    if Input. is_action_pressed("ui_right"):
        position.x += 4
    elif Input. is_action_pressed("ui_left"):
        position.x -= 4
    elif Input. is_action_pressed("ui_up"):
        position.y -= 4
    elif Input. is_action_pressed("ui_down"):
        position.y += 4
    move_and_collide(velocity * position)