It's very easy if you've played rhythm games before, like Stepmania or osu!mania. I noticed that the music was very desynced, and playing with arrows is really hard on a laptop, so I remapped arrows to DF JK (how I played in osu!mania), and easily passed it (97% acc) without sound on the first try.

It was pretty hard to do on mobile

I'm on mobile, and I think this is where I'm gonna stop.

It's the last one, you can do it!

The desynced sound is infuriating! :)

After struggling for a while I gave my phone to my daughter who solved it with 98% accuracy in 2 minutes.