Very cute and funny! Great pixel art, dialogue was a ton of fun, and I loved all the references to other game music. The hard cut to the parrot in the Santa hat got me good!
Gameplay-wise, I found it a little too easy. I actually did a second playthrough where I didn't hit any notes just to see the head actually grow. It also would've been nice if there was an obvious "missed note" sound, as it was a bit hard to tell if I was hitting notes or not.
Great job, and congrats on your first GWJ!