Now this is my type of game. Flesh this idea out and it's a banger. Would love to see rogue-like elements thrown in where you can get upgrades and additional projectiles and stuff. There's just a lot of cool stuff you could do with this.
As for feedback, after a while the rotation of the blade breaks. I got to 105 enemies defeated and at some point a bit before then it desynced and I couldn't tell where the front of the blade was based on the sprite. Also the UI is busted. Adjusting the master volume kept set it to 0 and did nothing. The pause menu also just doesn't work except for the quit button. I had no issues with the end-screen menu. UI is annoying and aside from all that, you got a great idea here, please keep working on it after the jam!