Cuphead itself shamelessly rips off other works, is what I'm saying. Really, really shamelessly. To a degree that's less charming than uncomfortable. So if another game wants to rip them off, fine.
Then there's the fact that that the character designs and animation Cuphead took from were often quite overtly racist, and in tweaking them just enough to put in the game, Cuphead whitewashed that.
But that's an essay someone else has already written: https://unwinnable.com/2017/11/10/cuphead-and-the-racist-spectre-of-fleischer-animation/
It's actually kind of hilarious how angry people are at Enchanted Portals for ripping off a rip-off.
"Did they ask the creators of Cuphead first :("
Idk who did Cuphead ask?