ASTONISHING! AWESOME! UPSIDE DOWN PINEAPPLE CAKES!
This game is completely original, addictive, and allows players to use their imaginations! I really enjoyed playing it, and even though it took about 6 hours of my day... *cough cough* I regret nothing! The ending song was hilarious! Dungeon crawling other people's maps can also be fun.
I suggest you add some more material, like coin stashes, that allow players to personalize their dungeons even more. More classes would be nice, too! Maybe (a) miniboss(es).
Also, when a hero sells an item, you should have to pay them for it. That is, unless you made item selling to be a top-notch income.
(I'd post all of this on Kongregate, but I don't have an account.)