I really enjoyed the presentation of this game, and I like the idea you are going for! Honestly, I've never attempted to make a rhythm game before, so what you would have to do to get things to sync with the music seems challenging. Perhaps get the BPM of the song and utilize that in your algorithm for generating the directions? There are programs / web apps where you can tap the beat of a song and it will calculate the BPM for you: https://www.all8.com/tools/bpm.htm
Good work regardless!