You should separate 3d games and 2d games, as production of this completely different. If you want to compare 3d to 2d games, you need to look at Ai generated 2d games and compare them. I bet you don't play this because they all look the same.
Turning the page, kingdom of subversion and hangover cat games all look like any other game from DLsite, I've played a ton of them, very simple and generic art style, I don't think it's a right thing to compare this either, gap between art direction even between other games you mentioned is huge, nothing unique or interesting about them.
Witch hunter is a good example and art style is very close to this one, updates even less frequently than game of whores though, not sure why did you mention it.
Stellar Dream looks nice though and I like sci-fi, especially since Akabur abandoned Star Channel 34, there's not many games to play, thanks for recommendation
Succum Brewery looks charming, not exactly a style I'm looking for unfortunately.
