I hope he makes another game after this one (i know he has a lot of expansions planned). One game idea I would really like to see him try doing is being the evil minion in a classical fantasy world. What I mean by that is you have a fantasy world where the queen, princess and leader of the knights (female) are kidnapped by the evil overlord, you play again as a shota kind of character like an imp (the kind that nobody pays much attention to). Using that you sneak into the prisoners rooms and you could choose the love and corruption route, maybe even have other demon ladies you could seduce. The whole point of the game would be to seduce the prisoners so that when the "hero" inevitably comes and defeats the overlord instead of being killed alongside him the former prisoners want to spare you and could either want to elope with you or bring you back home (depending on your choices) alongside the other females you might have seduced.
It kind of already fits the theme of urban demons, you are this kid that everyone seems to underestimate at first but in the end you win over the ladies.