A fun little management game held back by some superfluous grinding and buoyed by an engaging sex-battle system.
Playing the game on normal (it's highest and intended difficulty,) both for the management and minigame settings, is still very easy. You'd be hard pressed to fail; money is quick and plentiful, and many of the girls are pushovers to defeat in its battle system.
The consequence of this very lenient system is a relative plus at first: you're allowed to upgrade and research what you want at the pace you want with very little detriment. I say very little, because the negatives are obfuscated until the late-game, where you'll have to occasionally grind out girls and new research in order to fully complete it's main questline.
This moment is a bit jarring, as the rest of the game seems to be a-okay with you being a vastly overprepared for whatever you need to do. Even so, a rough estimate would be placing this grind as an extra 30-60 minutes of gameplay. For reference, my total game time was around 4 hours, and that was with screwing around in post-game. So not terribly egregious, but still annoying.
The forced grind would have been much, much worse if it wasn't fun to play.
Management sees you constantly upgrading your brothel and girls, and nets you money at a very quick clip. Down the line you're able to buy girls from other brothels whose 'love' trait you've hit 100 with, so you can build a brothel of monster waifus you enjoy.
Building on this, the brothels around town offer the usual collection of demi-humans, although with excellent variance. Ya got slime, ya got cowgirls, your foxes and your oni's, and each brothel features a different puzzle to uncover during the sex battles, which keeps it engaging.
The sex battles, to finalize this review, are the highlight. They play out as mini-puzzles where you have to out-fuck your opponents in order to win, using either touch, oral, or good ol'rammin. Most of the time you can do what you want, although every once and a while you'll need to have specific item or game plan to win. Furthermore, the game does a very good job of communicating what you need, and frequently rewards you for going the extra mile in these instances. Big plus.
Overall the game is worth your time. It can be buggy, as I had a few crashes, but thankfully there is an auto-save 'continue' irrespective of your latest save. Thank god, as I would have ripped my hair out if I had lost 2 hours of game time here, and subsequently rate this game much lower. Also a minor translation bug, where attempting to buy girls will say you 'have too many hostesses,' but this is incorrect: you need to max the girl's 'love' to recruit them. I have no idea why it didn't say that at first, but once I figured that out the text prompt was fixed. Strange.