Nice puzzle game and it could have been even better if it was a bit less dry, the problem is that there is not a lot of visual and auditory feedback, for example the victory is clearly to be revised, you don't feel that you have won, you just have the info that you can press enter to continue, which is very unrewarding. I can't give you exactly what should be changed because I don't know what your goal for visual and game feel point of view but I advise you to go and watch the "Juice it or lose it" conference which could help you to improve the game feel
but any way good job :)
I would appreciate if you want to try my game too, I'm with few rates :D
Thanks!