Very interesting game! I'm particularly impressed by the level generation! The style of the game is simple yet good enough.
This is a minor thing, but I kind of wished there was a small improvement on the gameplay. Throughout the game, I personally felt like there was only one way to complete a level. This led me to just guess (by trial and error) the answer after couple attempts.
Anyways, I still enjoyed playing the game and it was a great use of theme!