I'm going to give my honest opinion here - I love the art, I love the story, and I love the developer's previous game, Melty's Quest. However, I severely loathe this game.
This is mostly because of the combat system. I play adult games for adult stuff. I get that the developer is trying to do something new with mechanics but this is too Kojima for me. Let me explain.
Melty Quest, the developer's earlier game, has a simple lose-for-porn style, which was serviceable. The combat was typical RPG MV stuff - Fight, Magic, Item - you know the drill - along with typical adult game stuff - passive from clothes, lust damage. It was, hard at times, but at least I could understand the system, and how to play it.
Karryn's Prison on the other hand, has some next-level mechanics implemented. There's 2 phases - Mental Phase and Action Phase. There's 3 resources for actions - Stamina, Energy, and Willpower. Your body lust is divided into 5 - boobs, pussy, ass, cock(the enemy's), and mouth. Then there's a overall pleasure bar. There's a weapon's triangle moveset, for all the Fire Emblem freaks.
And all the actions have to be manually selected, every time. So you're doing - select will power moves - select basic will power- rotate selection wheel to end turn - select attack moves from new wheel - select slash - and then one turn ends. It sounds annoying, because it is annoying.
Furthermore, there's no scenes on winning or losing. Oh no, that's too easy. See, first the body lust has to be increased - which depends entirely on the enemy, of course. Then there's a pleasure gauge, which has to be increased. Enemies will take multiple turns, inching towards ejaculation, where you'll be rewarded with cum falling on Karryn or maybe see her boobs. If you're really lucky, you might even get to see a... blowjob.
I'm a simple man. I play adult games for the adult stuff. I can't play for 20 mins choosing shit that doesn't matter (you can't skip turns) with my dick in my hands just so I can see some porn. I have enough of blue balling in real life. The mechanics are just too obtuse. I wanted to see Karryn molested in the butt. I spent 2 hours - couldn't do it.
Apparently, the scenes don't exist yet. That's another infuriating matter - I have no idea what's in the game or not. Is actual sex in the game? Maybe if you get the lust and the enemy and willpower aligned just right - maybe you can just see it. Believe, and it will come true. That's how it works.
Anyways, there's also a prison management mechanic and actual stats, and level ups and debuffs, and accessory slots - cause that's what is truly wanted in a adult game. Just know I suck hard at making money, and I am broke by end of week. (That's RL by the way. Ingame its worse.)
In conclusion, once again, I loathe this game. Everything good about is let down by this convoluted mess of a system. If any developer is reading this, can you please make it that there's a clear path to the porn? That's all I ask.
For now, for me, Karryn's Emblem: Kingmaker of Eternity is 2/5.