A really solid foundation, very gungeon-esque. Sadly 9/10 times the stat changes between rooms would be enemy speed changes, and again in 9/10 of those times it would roll 0 so nothing would change. Very weird, but maybe I was just getting uber unlucky?
If you guys continued this post-jam (which I strongly suggest, I think it could be great) then maybe consider guaranteeing both an enemy and a player power-up between rooms? And eliminate or at least reduce the chance of it being a 0?
Overall very good work!