The genre is called "tower defense". There are plenty of good SFW examples of it, but the only other TD game on this site I've seen is "summon and fusion". And I do not recommend it, because both the translation and the game itself are kinda wonky.
https://f95zone.to/threads/summon-fusion-final-philosophy.68159/
As porn, it's okay. As a tower defense, it's dreadful, and actively detracts from the horny. I've black bordered a bunch of BTD6 maps before this, and Jesus the tower targetting is awful. Range upgrades can't be seen at all, only the base range. Sex bots are somehow more busted than Bloonchipper, and can be comfortably spammed onto the track to instantly have sex with goblins (this is the strangest sentence I've ever had to type in my life). The basic towers cannot kill the base waves beyond a couple kills, unless you want to micromanage tower replacements one-handed and be too busy with that to research. Porn games are deliberately very easy, and this is not that. And your reward for your anguish is sex scenes when you click research.
Fuck this game. Metaphorically.
Fuck this game. Metaphorically.