Lots of comments in one go ;)
I do want to talk about the chest/jug mimics, because I feel like they're pretty weak overall. Their casting abilities are cool and unique, but often I hope to get one instead of a normal jug or chest because it means they won't disappear. They're never enough to do any noticeable harm. I guess it's probably because they're more supporting characters, helping their allies, instead of being dangers up-front. To be fair, I think they have a chance of showing throughout the three areas, and it might be hard to balance the difficulty when it changes from area to area as the monsters improve.