i was not familiar with bonanza bros, so i searched for it on youtube. seems pretty fun actually, art style would take a bit for me to get use to.
though im curious how the vampires and stuff come into play, special abilities and that sort of thing.
stealth is a good idea, but eavesdropping would be pretty hard to implement corectly without voice acting, as having something text based would be easily readable.... unless, i could do a sort of word coruption system, so after entering earshot range. the charactors get corupted and replaced with a random charactor as they charactor speaks and the rate at which they randomly get corupted drops as you get closer to t them, though that might mean a more scripted event system where they talk about certain things at certain times, and im not too fond of that as its content that can be missed, with a gamejam its pretty important for people to see as much content as possible because of the limited development time.
secret rooms are good but only if there is something important in it, so ill try my best but with the time limit it might be a bit on the light side.