I dunno.
I guess it plays well, but the sex in it is tacked on. Super short animations when you interact with objects - at first it feels nice, but then you realize that it's over before you reach in your pants. And then it becomes a small, but still a time waster. Let me see what's in the chest, Not-Link!
Enemy sex is very rare (and doesn't seem like there are equips that make it happen more often. Luck maybe?), but at least game allows you to enjoy those animations at your leisure.
I think that at very least game needs a gallery, otherwise sex content actually hurts it, because dev could get a bit more bucks if it was just a bouncyful rogue-lite (and because you can't really show this game off anywhere).
The fact that people praise it so hard also shows that people don't really understand what they want from their games. I really don't know how this can be better than, let's say, Zetria.
Simple gameplay fits sexgame the same way simple plot fits a pornmovie. It enhances the experience, but there needs to be a balance. Add too little of it, and what's the difference between this and "those sluts asked for it: supercut" you can find anywhere. Add too much of it (or, rather, have proportion of it vs actual sex heavily skewed towards former), and people would rather it not have sex at all.
On topic of gameplay, I think "get caught to see sex" is actually a good idea for a sexgame. Because sexgame is closer to a sextoy, not pornmovie, and you don't sit and stare at your onahole/dildo, you use them. A bit faster, a bit slower, make a pause, go all out, lube flying around.
It also plays into sinful part of sex. You are doing something you are not supposed to (loosing), which makes everything spicier.
Finally, it actually gives you a special sexual edge to gameplay. Do you waste health on juicy scene, or you press on? Do you pass that obvious trap, or maybe you can afford to be "clumsy"?
Ultimately, much like there isn't a one game that rules them all, there isn't one specific sexgame design that is clearly superior. So, in then end, I guess the game is good. It's clearly a quality product, the artstyle is nice, and the gameplay is tight. Just, the approach towards sex is clearly not for me.