Thank you very much for the detailed, thoughtful and brutally honest feedback. I really appreciate it!
You're absolutely right about the aura-farming font. I was going for "night at the symphony" but that obviously shouldn't trump accessibility, so thank you for calling it out.
I love your ideas to explore the mechanics more. I've got some thoughts of my own too. This was a prototype for a game jam, so I had to limit my scope to as much as possible. If I have the time in the coming weeks, I'd like to add a lot more complexity.
I'm actually kind of glad you thought Vic was overkill. I wanted that "full band" level to be really challenging. That said, the difficulty progression probably occurs too quickly in this small version. I would try to smooth that out in a more complete game.
Your last point is also a good one. I wanted to implement a "dying"/booing off-stage mechanic a la Guitar Hero, but simply didn't have time. Another thing to add to the to-do list.
First impressions matter. I hope you'll come back for a second impression at some point!