I’m rubbish at rhythm games and I find Crypt of the Necrodancer to be bastard hard.
BUT, it’s not the keeping time with the music aspect that’s particularly hard. The vast majority of the time you’re just tapping out a 4/4 beat and the consequence for dropping a beat is usually just losing your score multiplier.
The difficulty comes from the fact that the music encourages you to make a decision with every single beat. Imagine playing a rogue like where you have to make a move twice every second.
The game is actually very simple, it’s just that the pressure causes you to make hilariously stupid decisions.
It’s on sale at the moment, it’s an absolute bargain and the price is worth it just for the soundtrack. The Switch is also the best platform for it. The d-pad is perfect for it.