I'm not personally big on weight gain, but I am still a sucker for Mystery Dungeon games, and this is pretty good for a Jam game.
I understand you've more or less put this on hiatus to focus on other projects, but I do think you did a good job with the additions in the post jam to smooth it out and give it more re-playability also, (only really snowballing at around 2+ tons).
Whether you've heard it or not, I'm sure you could have plenty of ways to expand upon this with food themed floors, different playable characters and effects. The main thing I would suggest is have rooms and hallways scale up to accommodate the character size, since it becomes tricky to judge which tile you're on at the maximum size.