Cuphead is a timeless classic. It's a game i'll never get tired of replaying because every experience is slightly different than the last. I think that's what I like about its often randomized enemy attacks, no refight will feel the same. That layer of uncertainty is what makes me come back constantly, and i've found the game to be even more fun when you decide to create your own difficulty. Many of my replays just involve me not using any powerups or charms and when you've replayed the game like me multiple times it adds on to the existing challenge of this game, i'd recommend it. It's fun.
That being said i don't need to repeat what's already been said a million times before, this game rocks, through and through. Totally worth the wait.