It’s not all as much gore as the brain parasite, but it’s full of scenes that are every bit as dark and fucked up. I won’t list anything in particular detail because of spoilers, but i’ve seen dozens of things that are super fucked up, and I’m not even out of act 1. I’ve had numerous people want to rip out eyeballs, failed a dice roll to mind control an enemy into eating himself, been suicide bombed, had a slave incubator for a witch go apeshit on me for rescuing her, and loads more. It’s absolutely super dark.
There are plenty of other CRPGs (good search term) that are fine with a mouse/keyboard. Larian kind of stands alone in terms of how well they handle with a controller though. Divinity Original Sin 2 is still dark, but not as in your face about it.
Other terms that have similar battles (but generally more closed maps) are tactical RPGs, strategy RPGs, turn based tactics or turn based strategy. I can’t break down the lines between any of those sub-genres, but they’re all kind of in the neighborhood. A lot of them are also dark, though.