Reached level 7. The music coming in and out with the panic meter is funny and smoothly composed, it's fun to listen to. I wish I didn't have to restart from level 1 every time I mess up.
Really happy you liked the music, the composer is, in his own words, “overjoyed” :D
I can definitely see how restarting from level 1 could be bleh, it could make sense to have checkpoints, maybe every 5 levels or something