100% controller game, as the game almost demands you to be healing all the time and spinning the mouse and pressing J is arguably impossible, plus it's terrible to have to put your eyes and attention to the corner of the screen when there's half a dozen effects on the center of it, and you most likely want to dodge most of them. I don't have a controller so I can't say how much more smooth it is with one, but I can say that on KB&M it's borderline unplayable.
That said, Sugar Plum Fairy EDM remix bangs