Not badly done at all, though I would say you need to do away with the mouse sliding. It would be better if you could click a piece and, if the empty slot is next to it, move it automatically instead of having to drag it.
Great artwork by the way.
I agre with grocery, simple game that does what it is designed to do. Easy control, no lag, no bugs. Deffinately need a mute button and I would say a menu as well if you die so you can go back and try again. That return arrow seems to take me nowhere
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