One thing is the graphics are a generation behind what you would usually expect from a game of this quality. I’ve been playing it and I can confirm it is wonderful, and the graphics just makes me impressed with the amount of focus the tiny team (33 people, I think?) put into making what matters great (though I’d be excited for a remaster in the future).
Edit: After watching more videos, I think it is, indeed, the mix of cartoon/early-video-game-era flashy animations on the screen (Or maybe think Batman comic books?), with a story-driven narrative, and characters that also toe the line between cartoon and realistic style.