Very cool lil' game, loved your pixel art as always and had generally fun playing it. The puzzles are pretty simple but still entertaining, I think that the concept could be further developed to make more complex puzzles with more elements. One of the rare downsides would be the last level, at first you don't know what to do and that's... normal but then you try to develop a strategy or get through it by learning the the level structure. The issue is that there are no real reference points, so muscle memory is sought very slowly and you usually go for "spam bullets and hope this time you will get trough". Making it very quickly frustrating and boring. Otherwise the music, sounds and art are really amazing, keep it up!