I really love the concept. It is implemented super well. I could see this concept, if developed outside of a game jam, leading to some really mind bending puzzles.
I do think that some things could have been more responsive. For example, it was hard for me to tell at first what had happened when I scaled the y down too low and crushed myself. The sound is fitting, but doesn't get the message across obviously enough in my opinion.
I also found the platforming controls to be a bit tough to deal with, particularly on the penultimate level. Unless there is some easy way of handling it that I was just oblivious to, it seemed to require some precision platforming, which felt a bit jarring considering the other levels were more puzzle-y. Tighter platforming movement would have helped.
Overall, really cool game! Would love to see it expanded upon and refined!