I like the fast pace. I don't like dogs and rats looking like the same red mist phantom demon from your nightmares. I'd like them to look somewhat like rats and dogs. Does every enemy in the game have this same avatar image? I like the look of Isabel. I like that she is endlessly quickly massacring every enemy she comes across. I don't like that I have no idea how in the hell she is so deadly. I'd like something in the game to indicate why she's so insanely killer. A massive sword slashing image? She's made of nanobots? Something to make it make a little bit of sense not just "hi I'm hot and everything I look at quickly dies"
And it's cool how there's story written in between fight stages. I think that helps people get drawn in or absorbed in it.