The art by itself would honestly be worth 5* if the game itself didn't act as an active detriment to enjoying it (good music ambiance for the scenes though).
It's good, it's uncensored, and it's diverse. More importantly, there's plenty on the devs site, which leaves me hopefully optimistic that the hardest part is already done with.
Patreon explanations for 4.1, 4.2, and 4.3 are helpful guides.
The dev's made it clear they wish to do this game through this engine for nostalgia, that's fine by me, my only hope is that the actual sex scenes stop going from blacked/unloaded to showing in the span of seconds. Because as nice as the art is, it's a seizure procedure to actually watch them in game instead of just fapping to the posted products on Ci-en.