My man, the best visual novels are text heavy. Think FS/N, Grisaia, Muv-Luv Alternative.
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Could we let people have fetishes? I mean, you're not forced to play the games, and there is quite a market. Especially for NTR.
Quite rare tastes. Got a little, but not a lot thats spot on:
The venusblood series has some animal play.
Kagura Douchuuki has snakes and things, but mostly monsters.
Doubutsuen - Yoru should be an instant hit.
Slice of venture, too much for me, but right by you?
saved the best for last...
Seed of Evil
Trap Legend (Gay, haven't played)
Divine Miko Koyori (Shintoism)
Corruption Of Champions 2 (Few characters)
BizzareHolyLand (Haven't played)
Do as i say - Obedience to the priest (Classic Nun Corruption)
Never saint (Havent played)
Nymphomania Princess (NTR, Havent played)
The...
Throw sloppy art in the art threads, get members+.
Then throw sloppy art in the + threads, get prestige 1.
Now, guess how you get prestige 5 the easiest.
That would require a major redrawing of multiple scenes. So not really in CGs. But i could probably make his small penis as his "nude outfit", so that its only large in sex scenes.
Just general management games, since i dont know any of those games:
Renryuu Ascension: Kingdom management
Monster black market
Cloud meadow: Farm management
Breeding Farm
Strive for power
Inheritance (Gatekeeper)
Anything from Pink Tea Games for slave management