This is a really tricky game to review, but at the current moment I believe a 2/5 is appropriate.
On one hand, I really, really like the concept of the game, and the bones are there. Incubus-style breeding games is an established genre, but there aren't very many good entries, and this has a lot of the bones that a great entry would have. It gives you a lot of freedom to do what you want, you get to breed a ton of girls and manage relationships with them, there's pregnancies, making babies, deals with demonic energies, etc. IF this were executed well, this could be a 5/5 game, a reliably satisfying sandbox experience. I really do truly believe that...
On the other hand though... In reality, this is a very very inefficient way to explore about 3 GB of porn videos. Like the main meat of the game is encountering girls, building up your relationship with them in pretty much an identical way, and having sex with them except... once you have sex with your "preferred" genre of girl... you can pretty much stop playing right there. Like there's maybe 2-3 hours of "real" content. Sure, you have your demonic spells, estates, businesses, stats, etc. etc. literally dozens of mechanics but they all lead to the exact same experience with the exact same videos with the exact same sex mechanics. The girls are functionally identical to each other outside of what folder your porn videos come out of, and the relationships are... "shallow" isn't even a good way to put it, there's literally 0 depth. The girls have zero concept of who you are outside of what their affinity stat tells them to agree to.
At the end of the day, I spend about 15-20 hours in the game to try to unlock further mechanics to get something interesting, but at the end of the day, the "work" is a SHIT TON of manual menuing and grinding just to view the same porn videos every single time. It is genuinely more efficient to just go into the folders themselves and view the videos themselves. The gameplay of menuing through the folders is pretty much the same as the gameplay in the game, the payoff is just faster lol.
How could this be improved to be that 5/5?
First, speed up progression of about everything up by like 5x. Everything you do with the demon girl, the police chief, the estate, the gang, etc. all happens after like 10 hours, and there's absolutely no reason to leave perfectly good content behind nothing more than continually menuing the same actions like 100 times. Oh, also make the menuing way less aggravating (there's like 5+ clicks to do ANYTHING in the game, that could be reduced by a ton). That would instantly make the game a 3/5.
Second, make the relationships with the girls mean something. Instead of having 5 different genre of girls, make it more so, as others have suggested, the porn videos are of the same models, meaning the girls themselves always are the same in the video. That immediately increases immersion. Of course, that means more encounters with the same looking girl; so what you do is lower the amount of girls you will encounter and court. This will seem like its slowing down progression, but its making the progression more meaningful because courting a girl and seeing her videos will actually feel like you're seeing something you wouldn't otherwise see by just going with any other girl of the same genre. Make the girls visit you at work more. Make them ask YOU on dates. Make them have an actual personality. Maybe they want to break up with you. Make them remember stuff you do. There's so much that can be done here to increase immersion and relationship depth and it'd all work, because right now the girls are literally nothing more than a bundle of numbers that gate you from seeing their genre of porn videos. If the relationships have depth, thats an easy 4/5.
Third, ditch the stats. Like all of them, except maybe just money and charisma. The stats "seem" like they're helping keep your experience "paced", but in reality its just tedious. Once you get a handful of girls willing to let you do whatever you want with them, you essentially already ignore stats. Once you figure out the loop of meditate->sex->mediate->sex, you already essentially have: ((100 Spirit) + (10 AP) + (50 Cum)) per girl you have access to. Do you have 5 girls willing to let you do stuff with them? Okay, you effectively have 500 Spirit, 50 AP and 250 Cum if you can bare to deal with the menuing. It's a complete waste of time.
Once you do the above, you have a game where the relationships matter, the stats that are still there matter, the content is up front and honest, and there's less stupid menuing and grinding. There you go, 5/5, a sandbox game I'd come back to time and time again to build relationships with girls and breed them.
Can the dev do this? Potentially. Though right now the game is nowhere near this.