This is really good. Between the audio and the visual design it gives me major Tetris effect vibes.
I think the level length could be shortened somewhat, by maybe 20% - the starts of the levels felt very easy and it seemed like I was waiting for it to get more challenging, so it could just start 20% of the way in (difficulty-wise).
I understand that this was probably a game jam time limitation problem, but a checkpoint system would be amazing - especially with the level length.
Overall this is great, I kept wanting to get to the next level to see what the environment/experience would be like. Really great job - and I do hope you continue with this project!