Very polished game! Polish has been the adjective of choice throughout my comments, it's a very impressive trait especially in a game jam format! Echoing the comments below, the art, animations, and sound design are very impressive and clean. Really hoped that the nested structure would've impacted the game mechanically, but besides that, great work!!
Bug report: On level 3 I believed I accidentally walked off a flight of stairs and walked out of bounds (on thin air), unfortunately breaking the game.