Really nice game! I really liked the the animations and the music.
I have to say I died around three times before I finally realised that I can hold space to give myself some easier timings, but it was still quite fun!
I'm honestly impressed you even made an easy mode and a hard mode, though I do suggest having easy mode unlocked from the start, instead of unlocking it after your first death.
It feels like the game is just saying "ey yo, you suck! here have easy mode lol" even if that wasn't your intention.