I would definitely be interested in seeing you taking this farther. Only problem I have with it right now is that once you figure out the trick, it's way too easy to just keep passing levels without any fear of failure (I'll assume you folks are aware of how the game degenerates, so I won't post spoilers here.) But yeah, a few tricks to work out the balance issues, and I can picture this being really fun. Definitely in my personal top 5 of the jam so far.

Found myself playing 20 levels instead of working just now.. I love the emergent gameplay. Very simple rules, and player basically creates their own complexity. How you implemented rotations is very clever too, with the one unbreakable block addition each time, changing the level while keeping previous choices significant. Congratulations!