I figured out the last room! The solution was so simple there were just so many red herrings lol (or maybe I just cheesed it, I don't know). I love this concept! I kinda wish there was an undo button or something like that, but other than that I don't have any real criticisms besides that I wish there were more levels.
Viewing post in Crystal Gravity jam comments
I'd love to see a clip or explanation :) I thought I made it pretty cheese-proof but if you found a way then congrats! The intended solution is in the walkthrough video linked on the page (the embed is broken due to godot funkiness).
I would have liked to have an undo, like in Baba Is You, but I couldn't figure out how to implement it with the code structured the way it was. Might try it later, though.