I think this game is really innovative! It's basically a rhythm game where the player can't just memorize the song. I think if you changed the sound effects a little (like a different pitch for each shield direction) one might actually be able to get some good music out of it! The organ in the background also fit the game really well.
The only minor nitpick for me is that the title screen is a bit blurry, but that's understandable given the jam constraint.