About hard bosses, I've gotten really good at Cuphead. I've 300%-ed it 3 TIMES,(perfected, S, P ranks) and I only played the game for about 3/4 of a year.
If we're talking about this, I think there's a bug in the game. I am on genocide, and I don't get a main menu savesprite (where you can reset or continue). Is this a bug or is this intentional?