Kind of reminded me of Merlin, another game in this jam (2D), where you are also a wizard who scales boxes to size to solve all manner of problems, check it out if you haven't yet, might be interesting for you.
These were well constructed puzzles that didn't forget the vertical dimension, with cool mechanics that worked pretty well, all things considered. The stylized graphics all meshed with each other really well, that look immediately stood out as looking quite handsome indeed. I agree with the other comments saying it was a bit too dark though.
My main critique point would be that a little bit of jank in the movement made the bits of platforming a tad more frustrating than they needed to be. I think it's hard to straddle both the platformer and puzzler genres well, better to choose one to lean more into and in your case, I'd say that's the puzzling, so if the player has figured out the solution, in my opinion, making the jumps to execute it should be pretty simple and forgiving. Just my two cents.
All in all, impressive work! Thanks for the game!