TL;DR: A COD Zombies side scroller where you fight to not let the enemies rape you. Main issues are poor weapon performance, lack of progression, and poor monetary rewards
Captivity is a very strange game, and as I write this review, I'm split between two parts. On one hand, the lewd scenes are animated very well, and they're also pretty kinky, what with how your character reacts and the sounds complement them as well. You've got normalish sex (from zombies), bestiality, insex, and even some stranger things, like aliens and FNAF strange robots.
On the other hand, the game play surrounding them, while not terrible, has MAJOR flaws. The game plays like a 2D COD Zombies round: Spawn in, shoot foes, get money to buy new weapons, ammo, and items to restore HP/Strength or decrease libido. Making the pointer where you shoot is genius, and that gives you a great amount of control and precision... that is, if your guns weren't horribly inaccurate. Even the safe and secure pistol, which thanks to it's infinite ammo and permanent availability tends to have bullets wiz over the enemies head, even if they're not twitching about or moving too much. Also, I think that either money rewards are too low, or prices too high; there are some rounds you can't heal both HP and Strength, simply because the enemies did not give enough cash reward. As well, it would take several rounds of no spending just to afford a weapon that is only marginally better than your current weapon. The dodge roll you can use is quite useful, but there are no invulnerablility frames, so the second it ends, you can be grabbed and assaulted, so that's not fair in my eyes.
Progression is simple, complete achviements (like kill enemies, get gropped, get knotted, etc.) to get pieces of clothes for Subject. This actually ties into my least favorite part of this entire game: Your 1000th run and your second are idententical. The first run, you're running around searching for what's where and what works, but after that, that's it. The way I figured it's work is go in, fight and kill, get mind broken, reset to the subject room, then use money earned for what you did to then upgrade what you have (Increase HP gained by Asprin, reduce the price of ammo) or buy new weapons to start with/purchase. But no. There is no progression at all, and that sucks.
Overall, my final thoughts are that while the sex scenes can be enjoyable, the end product is a frustrating game that gets repetitive quickly, and one that, other than the occational times I want to wank to some strange material, this game is not one I will revisit often.