Very nice aesthetics, I think you got a lot done with very little. The audio could've used some work as it was really glitchy (I would've just patched it by setting the volume to 0 when loading, since that's where most of it happened).
Gameplay-wise I think this is really cool! I was, however, unable to figure out how to get past the first level with the black boxes (the one in the game's page gif), since I was not able to collide with the black boxes. From looking at the gif I'm guessing you were meant to shoot at the 2nd white pillar, it may have just been me, but that wasn't very clear when playing.