I think NTR is mostly badly done and a question of personal taste. Maybe some players like to feel like losers with their chicks get stolen in front of them and that they get excited. Farewell, it's their taste. But I prefer no NTR or at least something storylined with build up, expectations and...
Hand drawn and pixel art must be really good, with faces and expressions and not too cartoony because it's a turn off. Animations are a must unless there are lots of images and transitions and good quality writing.
Renpy, very simple and stable when correctly used, compatible with almost every device. The only things that matter is the quality of renders, compression and gameplay.
It's probably because branching is exponentially complex and these issues :
- present choice to the player is good
- meaningful choice is better but split gameplay into branches
- branches without in game replayability means game restart to get all content
- amount of work for several branches...
You can try these if not already mentioned :
- A Wife and a Mother
- Shut up and dance
- Naughty Neighbours
And also from Dumb Koala :
- Princess Diary
- Mom's secret (excellent)
I'm pretty sure that easy access templates for DAZ models with poses collections would reduce the amount of abandoned games. Lots of devs start games with a good idea, something missing on other game, get audience and good feedback at first, and then abandon in front of the work needed for a...
Just minor things about forum topic display :
- signatures and images in signature could be reduced in size
- left user pannel on message could be reduced too to that short answers don't take so much space
All this for readability.
Yes I think, fantasy is used used way too much and it's disturbing that there's so much mix of unreal things and sexuality. Orcs and goblins are not sexy, fighting golems in dungeons is not erotic. At least make it not the majority of the game.
Lack of balance between scenes and grind
Not enough buildup renders before a scene
Too few transition between soft and hardcore
Mini games without reward
Lack of replayability for sandbox games
Irrelevant choices in VN
Non feminine short hair girls
Mindless characters