Awesome job! Really fantastic execution of a clever idea. I love seeing music and rhythm mechanics implemented in other genres. The aesthetic is beautifully nostalgic, and I could probably groove to that song on repeat forever.
I appreciate the difficulty, but I think one thing that could help alleviate some frustration would be using a first-in-first-out system instead of first-in-last-out when picking up and placing mics. That way I'd be able to make multiple mic movements on the same pass of the hand. I'd often pick up a second mic to move or to fix only to realize that by picking up a second one I had prevented myself from placing the first where I would have liked.
Overall, though, the frustration was minor and the enjoyment was through the roof! Definitely an entry to be proud of. And thanks for your feedback on Rhythm Rail!