I mean, beyond the fact that the style is insanely generic (you can use Mancin as a base and mix it up more) the quality is just poor overall.
Repetitive sex positions which are all straight out of the box generic prompts with no creativity, inpainting or img2img in sight. Bad writing as they go from talking to fucking in about two seconds flat, as siblings with no prior sexual history. No audio design, and he didn't even render or upscale at resolutions large enough to fit the full screen.
People talk shit about AI art all the time, but there's actually a lot of tools you can use to make it more than it is (both AI tools and image editing tools), none of that is on display here. It's the bare minimum. I gave +1 star though because it's a free game with no patreon, so kudos there as I do respect that at least.