I've beaten all of the penguins to death! Took me a long time, but I was able to squeeze my way past level 29. Super fun wave shooter, I was determined to see it through. I love the advanced movement needed to really pull it off, made me feel incredibly slick!
With all the hand crafted waves, it shocked me to see you're a solo dev! This is incredibly impressive, especially given the advanced music/instrument mechanics. Great job :)