Gameplay is an extreme chore because of how long levels drag on for and how much grinding you have to do to, since you have seperate upgrade trees for both the Explore mode (average Vampire Survivors levels where your girl gets raped on losing) and Story mode (boss fight and you get to rape the boss after to make them join you). On a good run, you'll only have enough gold for three Story upgrades at a time, and you simply aren't beating a Story stage if you don't have adequate upgrades to damage, defense, weapons, and movespeed. Worse still is that scenes with the main girls require gold to unlock, which can further slow down your progression if you decide to unlock them instead of your upgrades. The only alright thing is that you can undo your Explore upgrades to permanently unlock Story mode upgrades, and after beating Kureha (2nd last boss) you get unlimited gold to upgrade everything from the HQ, but it's still an extreme hassle.
Otherwise, scenes are good and have alright variety among the three main girls (i.e. peeping, massaging, fucking in a toilet, getting dommed), the numerous bosses who you can imprison and rape with BDSM-style sex (except for Kureha, who has more lovey-dovey sex that she doesn't deserve for being an extremely cringe boss fight because of the aforementioned upgrade system), or how you can get both your girls and the playable bosses raped by a gang of zombies by losing in Explore mode (except Kureha, who isn't playable and should be so I can toss her right to them).
Overall, it's alright. Grind is very annoying but the sex scenes might be worth it depending on your tastes and how much you're willing to put up with said grind.