Hey. The premise is interesting as heck. Now I'm wanting a fully funny SFW (and lighthearted?) game with it, and it would be even funnier if they were actually the independent party that both humans and monsters depends to clean the dungeon, with both of them letting them alone, and maybe discovering funny and interesting stories from both sides during the game. Also, if they really want some conflict/battles for the players, make them deal with the unruly ones that don't follow the rule of "leave the cleaners alone, because everyone here needs them".