I really want to enjoy this game because the artstyle is perfect 2000s X-Men, but it's just a decently sized sandbox sex simulator, isn't it? It actually doesn't have character development, story, plot, or lewd events at all does it?
If ONI stuck to the things he can do, and got a team this would be an awesome game, I think many of stick to it because we still believe in its potential. This one also came rather early.
There are lots of games that call themselves sandbox but very few actually are,
most of the times you go on rotation between locations to see the next step with a girl, and most relations are tied to someone else despite the promise that it would not be the case and no indication ingame that your progress with X is stuck and most importantly despite the milestones reached with a girl you can't do anything with her.
I can praise this game in many ways I think, you can make your own harem or stick to one girl, hide or do stuff in plain sight, there is lots of freedom, you can treat someone poorly and makeup later, if you can convince them you can do lewd things all over the school, have them mix and match their outfit so they change in every other situation.
There are relations, sometimes the game will surprise you, the girls show initiative, you may talk with them and something they say initiative a situation, they may interact with each other, you get the sort of feeling that they exist even when you don't, but are still affected by your actions.
Alas, the game's code is such a mess that most modders gave up or work on it intermittently, this is RenPy is supposed to be light and simple and the game takes a tool on good machines. The content takes a lifetime to release, I can't even remember how many years ago Gwen was shown, more girls get added, but that creates more problems, beside the bugs that I can only guess, but you might get interrupted because 3 girls want to get their stuff taken care of.
Gwen took years to come out and she is cute but her face as someone said looks like a western's "how to draw anime", instead of adding girls there could have been animations or drawings of all the things that the game describes the girl doing, after all this time there are still no real 3some animations, only descriptions and sure my imagination can make the work, and as I said, I can believe in this world, but at this point it feels like playing a modded version of the game he made, meaning something where content has been added at the expense of making it less stable while the core mechanics still feel the same.
I am a lazy person, if I were in this situation I might act the same way, but when I look at those developers that actually expanded, got more people involved, they saw better returns. Most people fail, look at all patreons of all these games, take the good ones, do all of them make a living wage? I wish ONI understood how lucky he is.
Ask the architect how many this post has been written, you could fill multiple threads about it.