i think unity is overkill for these types of games, most of the devs are bad and then the games feel sluggish. i think renpy is just good for vns overall.
i think sometimes you can tell there is some actual mental stuff that is present in the author, like when they overly concentrate on some super specific aspect over and over again, i tend to mostly just stop playing when i think that. often games that have violence in them tend to be like this...