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@lemu_kymoh thanks for your help. I have a mistake when I fogot to turn off the comment in another script. I have changed the connect method too and it's work. Actually, it's still delay a bit but I don't think it will become a big problem.

When I tried to overlap the item and pick up, it will have the error like this image. If I tried to press key many times, it's still pick up the item after delay some second. How can I avoid or fix this issue?

discord: @nguyendung22122000
my thread: https://godot.community/topic/65/the-way-disable-the-diagonal-movement-keypress-aw-as-wd-sd-of-the-charater-in-top-down-2d-game

@sepTN oh, it's cool

I have this problem before, and this is my solution, you can reference it. I tested your script too, and it doesn't allow overrides. Maybe you can change it with dictionary method, but I think it good for beginner.

    var direction := Vector2.ZERO
    var move_speed = Vector2()
    if Input.is_action_pressed("move_right"):
        direction.x = 1.0
    elif Input.is_action_pressed("move_left"):
        direction.x = -1.0
    if direction.x != 0:
        move_speed.x = SPEED
        direction.y = 0
    elif Input.is_action_pressed("move_up"):
        direction.y = -1.0
    elif Input.is_action_pressed("move_down"):
        direction.y = 1.0
    if direction.y != 0:
        move_speed.y = SPEED
        direction.x = 0
    move_and_slide(SPEED * direction)