Nice game! Right amount of silliness and challenge. Pretty polished too and fun challenges per level. If you should continue working on this, seeing what more combinations could be used to solve puzzles (such as D and Space) would be fun.
Ideally I would make the tutorial simply the first level. That way people don't skip it and it just feels part of the overall game. I'd also prefer finishing a level to just automatically lead to the next one.