The graphics are nice and work together really well, I like you paid attention even to small details. Animations are running smooth. Clever use of the theme and even more clever use of controls :)
Only one thing to improve - controls. I would really like to just roll my finger over keyboard in single move but I have to always wait for animation to end so I can press the next key. It always break momentum of the game. Otherwise I like it :)
Good job!