Thanks for reviewing my game and unfortunately I could not join your stream as it was 4am in my timezone.
There are a lot of nuances in the game mechanism as I am still trying to invent some new control schemes. Basically the mouse will only steer the directions and to encourage people who are not familiar with rhythm game to play I actually make it to partially automatically progress.
I would say do not worry about it too much as it is just a prototype. My main goal is still to let the players to enjoy the game! (Just like how you commented my GWJ#32 submission - Lofi-7.)