Need Feedback!

Link = http://ludumdare.com/compo/ludum-dare-35/?action=preview&uid=49861
Submitted the demo early. Now I’l dive into graphics and levels.
Tell me please if adding somthing would make the game better.
Features I plan to add:
– An undo button at least for one move.
– Menu.
– Somehow indicate the “player”.
– Levels.
– Graphics.