There isnt much to fuck up in a visual novel really. Although it does make things like renpy look so much worse than they are, i’ve seen very complex games made with renpy, visual novels still, but like you could walk around places and interact with characters, the characters had schedules even.
I’m not surprised at all, Manga-style characters must be so goddamn easy to make with genAI considering the quantity of training data and how similar it all is.