The art style of Cuphead is one of its defining traits, outside of the absolutely punishing difficulty. The game’s look, which is inspired by 1930s and 40s cartoons, is instantly recognisable.
People are beginning to run with it as well. In a tribute to both Cuphead and Dark Souls, YouTube channel 64 Bit has put out a pretty dang cool animation converting bosses from From Software’s classics into the Cuphead art design. In it, you can see re-imaginings of the Gaping Dragon, Great Grey Wolf Sif, Ornstein and Smough and others. It looks really great.
Take a look for yourself here: