Hi!
I'll be honest, first, I had no idea what to do (you could try to make the tutorial more interactive), but after a few turns I figured it out. :D
I really like the graphics and the music (you should add more different tracks though), but the interface is hard to read, because it is too similar to the game itself. I didn't even realized there is a timer up there until 3-4 plays.
Anyway, it's a good start, add some juiciness to it (camera shake, sound effetcs, etc), make an Android version and it can be a really cool timekiller! :D