Hey Pyrious, thanks for the feedback!
I definitely agree with the difficulty spiking too hard with the rotating blocks, most of those puzzles were made very late in the Jam and I didn't have enough time to get people to playtest and refine them like the earlier levels.
Regarding the music, I actually wrote a few more tracks but didn't have time to integrating them into the music system which had already ballooned significantly in complexity as I'd never implemented an audio system before. I hope you were able to locate the mute button in the settings / level selection menu and listen to your own music after it got grating.
If you didn't already you should check out the last level "Transcendence" as I'm particularly fond of how ridiculous it is.