Game is good, the concept is not unusual but realization is good,
It made my brain thinking
The art part of the game is not very impressive(Simple squares and colors) , but it is not a big problem, the game is still fun!
Also there is no any sound(I was playing WebGL-version of the game, do not know if it's bug of this version).
At the end I want to say, that game is good, but I recommend you to use sounds(If it was't used) and more graphics decisions.