Look's interesting, since it's early stages will wait and see how it develops, will give feedback specifically for the game then.
The only thing I can think of is to point out some traps to avoid as you develop your game. Sorry if this is too wordy and blunt.
- Adding too many characters. Turns the game into a never ending cycle of additions and ultimately a game that never gets completed, makes it harder and harder to put enough character development in every character and can result in a lot of 'doll' characters with cliche/uninteresting personalities. Probably not fun to do either since it just adds more and more work.
- Fixed Patch by patch plotline progression. You might be thinking what do you mean by this, i.e patch 2.1 = plot prog with char A 2.2 = plot prog char B 2.3 plot prog char C then 2.4 plot progpart2 char A.. and so on. Now the Fixed part = you have to play 2.2 and 2.3 plots to unlock 2.4 plot. Whatever you do don't make it like this, it's super frustrating for a reader to have to go back and forth with different characters. A route system is always preferred.
- make a good story and have that be highest priority, some other games just abandon this completely after a while and only focus on making porn scenes and never finish the game.
Well that's all for now good luck.