The music drowns everything else out. It's also weird that the enemies appear to have some variation in how high they can jump while you are static. I felt like I didn't have anything to do against enemies jumping unexpectedly high, though maybe I'm doing it wrong.
Congrats on coordinating a team and matching the theme! This was a hard theme and I'm hard to impress with 2d platformers, but this was pretty fun. I like that the upgrades aren't introduced right away, giving me some time to get familiar with the controls before adding freedom with health and speed. I was just starting to wonder what's stopping me from just skipping the enemy encounters, so having a place to use points is also good.