Good stuff. There's a big, unfilled hole in the marketplace for the 'alpha sadist' enthusiasts that also want a story on the side, especially if you limit it to works that are English-translated. There's plenty of games with edgy sexual violence, but it's rare that the time is taken to weave a story of any depth around the raw physical abuse. Most of these games, the girls aren't really being thoroughly, psychologically traumatized. And even when they are, that aspect is glossed over in favor of more screen time for violent beatings with half-assed context.
In my opinion, you can't really feel the humiliation, frustration, and pain of the target without some character development and background on the relationships. And to me, that is the most exciting part. Sexual violence for the sake of sexual violence is boring. On the other hand, getting to know a character a little, then watching their suffering unfold as they're mentally crushed, is infinitely more arousing and interesting in general. I might have issues.
Anyway, point being, Enslaver hits a nice balance. It sets up the sadistic scenes for adequate dramatic impact, but isn't so long-winded and bogged-down that your arousal turns to annoyance. Again, just good stuff for a niche genre that doesn't see a lot of real love or effort put into it typically.