Really solid entry, felt fun. I liked the theme interpretation, and the tiles sold it well. My only complaint is that there wasn't a full reset stage / back to main menu (that I saw anyway). It wasn't often, but I think I got into a bad state on stage 7 and I'm not sure the undo would've gotten me back far enough :D
Viewing post in Chiki Puzzle jam comments
The undo will work no matter what, now when I see I built the system to avoid double entries if x is on top then I don't place it on the stack again, and when the room is switched I place "switch" on the stack, if you were to switch 2 times and undo, it would happen only one time, the only thing messed up is that rest of it works sorta, though sorry about it should have added one, glad you had fun.