Hi! I haven't had the time to play all the way through the updated beta yet (I'm on level 5 or so, I think?) but I just wanted to pop in and say that I really appreciate all the changes, especially the vertical tracks for the notes and the ability to turn instruments on and off once they're completed in a level.
I know you asked for feedback to be in by Jan 31, so I thought I'd send you some quick thoughts instead of sitting on the game past the deadline. If it's helpful to you, I have recorded gameplay from the first few levels of the updated beta - let me know and I'll post it or send you the link.