I like the concept and it captures the Jam's theme perfectly, good job! Gameplay is simple, but can get tricky, especially when you consider to give harder quests to newbies to keep your stronger heroes safe.
It seems like you were planning to add some sort of currency into the game, that you could get from successfull quests. I think that would definitely add more depth. I can imagine buying a potion to heal up a hero or a better/different equipment for them.