Great but not a 10/10 "everyone must play!" either due to how extreme the themes are. The first scene in particular was brutal as numerous revews mention.
I say this because I was certainly not too into "Ryona" content and this is littered with pain, abuse, suffering, and very harrowing themes. This is not a scenario where the heroine secretly enjoys this. It is very clear the focus is on her pain. Whether it is physical, emotional or whatever. Really think about that before you blindly assume this will fit your palate. I've played a range of H-games and corruption/rape are often very frivolous in them. Where it is optional, not discussed, or is clearly divorced from any narrative beats. This game revels in the anguish on every level for the MC. Sadly she never gets much agency from what I can see a little less than halfway through. The gritty reality would be nice if she also got her revenge in brutal ways or something.
Instead all of the realism is purely in service of hurting the MC as enemies never really get any focus on their punishment. They get killed like any other generic enemy and this does cheapen the feel of the plot. For me it helped me to start to frame my mind as this being about the scenes and helped me lose my investment in the MC. Especially as she fails to really adapt up to where I am . She mentions her suffering a lot but really it feels like it is more for people who enjoy that as opposed to a true deep analysis. In short it is smutty shock value. People saying it is super deep or really analyzes what it's like to be a victim are singing its praises a bit too high. It's there to get your rocks off if you like the suffering angle.
Now I know some people like these harsher themes! Even with my discomfort with how extreme some scenes were, they were still well made.
There is lots of fun ideas, positions, great sound work, and it's awesome that you can do so much during the scenes. You can change perspectives, move the camera everywhere, change costumes, change the damage of your outfit, change your body proportions, change the speed, and even have mini-cams of different angles.
The gameplay outside of sex scenes is okay. People give it a lot of credit but that's just because it is good by h-game standards. It's not anything you'd likely play just for combat or platforming. The story is also not so good that you'd find it amazingly satisfying without the h-scenes. Some people overhype this aspect. There is some platforming, secrets, a skill tree, but it's nothing to write home about. It's fine and don't assume you're missing out on the best h-game ever if the themes bother you at all.
The story itself is kind of okay. The MC acts realistically in her mental anguish but not really outside of it. A lot of the choices she makes are in service to getting into trouble. For example withholding issues she faces from her fairy companion. In essence it is best to accept she is just there to be abused and act innocent as long as possible, even when she should be acting differently or could have interesting development. She doesn't seem to get angry or get vengeance in a way that could give her some agency after her suffering. For me this takes me out of the tale but it does help to make it easier to stomach I suppose?
TL ; DR consider the brutality of the theme and understand it's not your standard "heroine secretly wants it". Skip if that sort of theme bothers you.