I unlocked map of the staff-only location AFTER defeating Beelzebub and activation the third fountain and this fountain doesn’t appear on the map. I think that’s a bug. It appeared after restart, but anyway.
Game is nice and fun to play. Not too hard overall, hard to loose common fights, bosses are harder, but not much. Beelzebub fight was a surprise, nice game-design here, had to think, grind a bit to upgrade chars and try different strategy. About upgrades and grind - it’s too much. Common fights are too easy and not interested enough when you need to them in bulk. And you NEED them in bulk if you want to upgrade all chars to 100%. I played for 4-5 hours and only got main char to 70% when other chars only 11-20%(basically just unlocked all abilities). Also there is no dedicated location for beast-creatures(brawlers), I hope you’ll add it or make some rooms brawlers-only idk. Casino = goblins, staff location = imps, then Beelzebub-related part of staff location = zombies, but if you need to farm bandages - you need to look for brawlers in a couple of first rooms and there is basic goblins in those rooms as well. Also sometimes enemies walk through walls and obstacles. Also after some time playing game start to lag(fps drops or something) when you go between rooms consider to look into some optimization techniques (My specs: r7 7700, rx7900xtx, 48gb 7600MT/s).
Maybe you can also add some dialogs to point out where to find acid and that fisher gobbo opens a shop after you give her shroom? For example keep shop sign there with a note “closed. went to fishing.” or something so players would know that there is a shop at that location at all?