I really like this game, it's very fun and one of the few female protagonist games I like that's in visual novel form. But also I think it still needs a lot of work and has potential if cooked correctly. The main thing that bugs me is no sound. If it had sound it'd make it 10x better, especially if there's moans and screams during sex scenes. Secondly, having everything at 100 at the gym seems useless. Yeah I get to work at the gym, but it pays the worst out of all the jobs. Third, too many menus at some points. This is a minor point and may be a personal taste, but it starts getting tedious going through menus just to do something. Like instead put everything in one area, not three locations. Also, there should be more dating options as the female protagonist, not really fond dating people you're related to lol. Also add going to school and rework the money system. Lastly a pregnancy system would be peak.
Lastly, I think it'd be cool if the city becomes more depraved as the story progresses. Say when you first get there it seems normal, but slowly as the game progresses you get groped and harassed more and more as you try to to find out who you are and how you got there. I'd push the dad raping you until you get mansion, then you get used and abused by your brother and dad and rapes are much more common. I'd make the ending that finally with a high intelligence stat you can find out the sex cult was behind the reason everyone is horny and they make you a sex slave. You either stay in the sex cult enslaved or finally accept it and become a sex crazed citizen.
That's my two cents, nice job on the game!