I've been meaning to ask i dunno if you already addressed this somewhere, i couldn't find it. But do you have any plans/ideas at the moment about the next game you are thinking of doing? I am not sure how far off we are from the ending of Harem Hotel but i can see a lot of potential for the next game you eventually do. I guess it depends entirely on what you want and what the fans want.
Personally with all the elves introduced, non-canon Violet story, succubus outfits, cat-girl outfits, i was wondering if the next game would go more so in that direction? Having more non-human girls in the game is definitely intriguing for me. Of course there are certain limitations i don't expect you to be able to do a lamia or anything like that i dunno if that is even possible, but doing cat-girls, bunny-girls, elves, succubi, vampires, oni, etc... seems very plausible and easy just adding horns, ears, eyes, etc... And of course we can have normal human girls as well, nothing stops us from that.
Anyway just food for thought, whatever ideas you have for the next game and if you have them at all at the moment i am all on board. I really like Harem Hotel, the direction you are taking and the way you interact with fans i'd play and support your next game regardless of what it ends up being.
Cheers.