Amazing.
Amazing game. Truly.
One addition that I'm sure would be appreciated, however, is a Hint system. It isn't particularly hard to get stuck on this game, and as rewarding as it is to feel like you and you alone solved the shape, you'll never be able to advance past the level you are stuck on to feel that rewarding feeling again if you have no help...
So yeah, please add some sort of Hint system. People hopefully won't use it too often and resort to using it only when being stuck is starting to get frustrating. Please give me a hint for Level 17.