I love these kinds of shooters. And I think you pulled this one of pretty well! I like the minimalist graphics and color scheme and the controls are responsive as well. Though at the beginning I got a little bit confused on what I was supposed to be doing, eventually when I understood it ended up being really fun and engaging. This take on the theme was also extremely innovative, and you did a fantastic job incorporating music into this.
The only things I would note is that it's really easy to get overwhelmed in the beginning. A bunch of enemies can spawn all of a sudden and the next thing you see is a blizzard of bullets. You could smooth out the difficulty curve over time by slowly increasing the interval at which enemies spawn the longer the player goes. Also, it would be nice for the game to shoot when I'm holding down the mouse button rather than spam clicking since I'm terrible at clicking fast.
All in all this is a great submission and take on the theme! You got some good stuff going and I think this will do pretty well!