While it's just the prologue, I wanted to give it a 5-star rating to help the developer gain more attention.
Besides the visuals, the one thing that I value with VNs and games on this site is the quality of the writing, and sadly far too many developers lack a talent for it, or their ESL shows through.
Not to disparage the effort those other developers put into their projects, but nothing takes me out of an experience quite like writing that doesn't flow very well, or is full of Engrish.
Thankfully, the dev here really did a good job on that front. The dialogue is well-written, the three characters introduced so far all have their own voice, they actually talk to each other like normal humans (in the context of a porn game). It all feels really solid.
If there's one minor ciriticsm, it's that the characters are a tad too verbose, which I can see some people not liking.
The visuals themselves are a mixed bag - the backgrounds are rough, but do the job well enough, while the female characters, which are the important part here, look very good. Also, a big plus for the fit girl being the first one we get introduced to.
Criticism here is that the MC looks kinda bland and expressionless, but that's an issue most of these games seem to suffer from so I don't want to hold it against the dev. At least the protagonist looks the part.
As for the plot itself, it's nice to have a protagonist that isn't a complete loser and creep, and while the direction the plot is going towards hasn't crystalized yet, I'm interested enough to see where it's going.
All in all, a very promising start for a project, and doubly impressive because it's the first game developed by the author.