Cuphead is an impossibly gorgeous game. The boss rush title sure was pretty hard when I played it, but that art direction has never failed to be alluring.
The game isn't just animated to look like an old animation either, it's made like one. It's been painstakingly hand drawn from each enemy and then rendered in game. In a new interview with Time Magazine, there is a video showing off the process. There are quite a few gifs too to look at, so head over there if you want more.
Take a look: