I've debated whether or not give this game five stars, but ultimately decided to go ahead despite some of it's pretty obvious flaws simply because of how much I have enjoyed it.
Superhuman is a story of a pretty avarage guy, just about to start college, who unexpectedly (and somewhat dramatically) gains superpowers - he can shapeshift, read memories by touch, and becomes far stronger and toughter than he was before. While there are some horror elements sprinkled in from the very beginning, at first it feels like a pretty usual porn silliness with a supernatural twist to keep things fresh. MC pushes some bullies around, starts gathering harem, explores his power to get laid, or transform into a girl for a epic masturbation session - you know the drill. However, gradually things get more serious: as we learn more about the world and dangers in it, as MC gets more and more powerful (which, of course, garners attention), stakes get higher and higher. Eventually, you get to a point where you have a large scale battles, secret organizations, eldritch deities and so on - and somehow, it still feels like a coherent story. You can also have monster sex, or even get a bit monstrous during intercourse yourself, if that's your thing.
Main strength of this game is writing, especially later on. It's not a great literature for the ages, and some parts can be a bit rough (mostly at the beginning), but it is still a ton of fun - it feels like a good webnovel, a great guilty pleasure to get lost in - think Worm with porn. For the most part, characters are interesting too. You also get some choices regarding morality: you can be pretty twisted and monstrous if you want to, play as a (mostly) stand up guy, or hover somewhere in between. Game isn't finished, so it's hard to say how much any of that will matter in the long run, but it's certainly nice to have some flexibility. I also have to praise how Superhuman shows progression of the MC - there is a lot of attention paid to improving and training your powers, and it's quite satisfying.
There are, however, some flaws that I must mention here. First of all, game is a bit rough at the beginning, with uneven writing and sometimes campiness that makes it hard to take whole thing seriously. It can be good for a porn game not to take itself too seriously, but I think it goes too far here sometimes. That, for the most part, gets rectified later in the game (kudos to author for improving). Secondly, while you have a good selection of potential partners (and you can get all of them too, if you want), not all of them are equally interesting, or integrated with a story. At least one character is kinda ridiculous most of the time (police officer always dressed like a stripper, which game even points out), and after a certain point most of the girls get kinda left behind by the story - they are still present, and an effort is made to have them included to some degree, but currently they are not really central to the main storyline. Except one girl that pretty much becomes deuteragonist of the whole game. Which I personally was happy about, but I can imagine some people might be a bit salty if their preffered waifu doesn't get nearly as much spotlight. I wil however repeat that the game is not over yet and author could certainly reinstate some of the cast members to more prominent role.
The last mark agains Superhuman are visuals. Let's be honest, I think that they are rather bad in the beginning, and I have a distinct impression that author was way better at drawing monsters than humans. The fact that some of the women have boobs the size of a small european country doesn't help either - I like sizely tits, I really do like them quite a lot, but there can be too much of a good thing, and it's clearly the case here. By consequence, many of the lewd scenes are not really that exciting. That also get's better, slowly but surely, and currently new updates look ok for the most part - still not amazing, but improvement is substantial, and hand drawn graphics have their own charm that sets this game apart from hundreds of near identical garbage with the same souless, 3D models (obviously there are great games with renders here too, but I hope that you know what I mean).
Despite those flaws, Superhuman is still one of the most interesting projects on this site. There is a ton of content here, and it's still not done. It's a bit rough around the edges, but in my opinion the worldbuilding and enjoyment you get from progressing your story, and building up your powers far outweights any flaws this game has.