A lot harder than it looks. I tried without the tutorial and had no clue what I was doing (the record stop SFX became a bit of a repeated jumpscare, lol).
I went back and did the tutorial. At first, I thought the game was still stupidly hard, but after realizing exactly what the "smash" control was, it became manageable.
Nice visuals. Good SFX. Cool use of the theme. Very creative idea; platforming on the music you're playing.