Overall a nice game, even though it's sort of short (unless I'm missing something and the level with "THEND" isn't really the end of the game). Graphics are nice for a minimalistic puzzle game and helped by the effects. Music is overall nice although the sound effects started feeling too repetitive after a while. Level design was appropriately challenging. New mechanics were introduced as the game progressed to keep it interesting. Two small gripes I have are that the movement feels a little too slow and clunky, even for a puzzle game where speed isn't a big issue, and at one point I stepped away from the game to make dinner and came back and it had inexplicably reset to the first level.