Length: Took me 8.5 hours to finish my playthrough. I then unlocked all CGs, but you can do NG+ to do other routes if you've got more time to spare than I do.
Story: Foxgirl MC gets enslaved. Narratively it's very brutal and you hear of other slaves being cruelly killed, but you don't see any of that violence yourself (the most extreme is a not-extreme whipping scene, in which the girl comes to enjoy it by the end). It can be a slow burn corruption story, or you can resist, but either way the main character is strong and very likeable.
The artstyle is inconsistent. Some CGs I thought were okay, some I loved, but on average it was better than most erotic games. However the illustrations you see most of the time - the character portraits - are super high quality. I loved Oretti with all her expressions and poses, and also seeing her bare pussy in certain angles, or tits when its ripped up during combat. It adds eroticism to moments that otherwise wouldn't have it.
A lot of the main scenes are animated (with something like Live2D). I normally really dislike this kind of animation, but I thought it was great here and added erotic value. Like in one of my favorite scenes, you can see the character's eyes and expression changing back and forth as they struggle to resist, you've got jiggling boobs, bouncing hips, fox ear fluff-tufts shaking around, and the hips zoom in to the camera during climax, as if bucking. There's just a lot of attention to detail, to the point where I'm going back just to watch some of the animated stuff here and there.
The writing was okay. Better than most, including non-translated works, but the bar is low. Translation errors were few. The erotic writing was good - it was, for the most part, worth reading. But it wouldn't be interesting to read in and of itself (save for a few scenes). As with most erotic games, the illustrations are the main dish; the writing is mostly just padding out the amount of time you're looking at the illustrations, with some golden lines interspersed here and there.
Music was okay, and the voice acting (Japanese only) was pretty good. Some of the moans or lines were great, but I often did skip it to read faster, too.
Gameplay was quite fine, I had no issues. Hold down Ctrl to increase speed - this works for the hub menus too (i.e. holding ctrl makes new areas load in faster).
Oh, I also gotta say I loved the little splash images they had for generic scenes around the city.
Overall, it's a great game. Focuses on eroticism, with slavery themes. I'll probably replay it a few years into the future, if I'm still alive then.