Had lot's of fun. Really cool idea excecuted well I would have loved more cannon stage, felt really organic shooting with such simple controls though I really liked the more puzzling stages too. Got some problems with windowed mode in some stages but almost felt it was part of the game. The only nitpick I have is that I would have liked a custom cursor for the game.
Great work!
/s spoiler
...Is really finished when it says "goodbye"?