yeah, a common mistake that individual developer usually make is wanting to put everything in a single game. See how many tags we already have in this game? He can just creat a series, and make it like"Harem Hotel:exhibitionism ""Harem Hotel:dungeon""Harem Hotel:elv revolution"
Why shoud he aim for so low?
The next step would be HHU, Harem Hotel Universe a massive multiplayer online role play game. Were you can be anyone and interact with anyone.
Buy your own elf, take them to your nice home and chat with others (of course everthing will be price appropriate) and you can talk to our friendly customer support, if you have encounter anything you don't like. Our customer support helpline will listen to you as well as any elf slave you could buy in the game and this only for 0.99$ per second.
And on a serious note. The game and its content is, for my taste, well balanced. It has nice story and character development and he try to have a place (and content) for any of the characters.
Sure, Jin could be given some love. But I don't know what Runeys plan is with her and taken into account how I think he does this, it could be that Jin would be needed for Lins story or in the next update she receive a major content update.
In addition they are plenty of repeatable scene and much fetishs are presented, but not forced. I don't see this in games here much often.