DubConqueror: I'm glad it's a NSFW release that's not in anime style. What's with 90% of the NSFW games being anime games?
Likely because anime and manga are most popular among geeky sorts, who are mostly the ones who make games in general, including porn games & VNs. Also, these days it's probably much easier to find online guides on how to draw in popular anime/manga styles than it is to find guides to most other styles combined, thus it's probably much easier to find artists who can do anime art than it is to find those well-versed in other established styles, let alone those who have (or wish to develop) their
own styles.
Not that 3D-rendered CG is any better. As much as I dislike most anime in general, and as sick as I am of the same few tired anime art styles popping up in everything, at least there's often small variations between different artists' work. There aren't really any such differences in these budget 3D-rendered games, where most devs/artists are using prefab character models, morphs, animations, etc., as their bases.
And even if a given adult game doesn't use an anime art style, it's always a safe bet that it's still going to be chock full of tropes and character archetypes from -- and maybe references to -- anime/manga/JRPGs. Because a lot of weebs apparently can't get themselves out of that headspace enough to write something that will appeal to anyone outside of that (admittedly large) scene.