Very interesting game! I have always found games focused on the beat of a song to be very fun. Would you say it's hard to make a game that focuses on a song? :D
I don't know if you've heard of Game Development World Championship before (gdwc2019) but it's a competition for indie game developers where they can submit their games and it's free! It's great if you want some more visibility for the game and it only takes a couple of minutes to join :)