Great theme, visuals and sound! Congrats on a great jam game!
On the feedback side, maybe I missed something but it seems quite difficult!
The enemies seem to absorb a lot of bullets while the player dies from three hits, and the enemies are very precise and can shoot you from off-screen. I would make the enemies die from maybe 2 hits or so and keep them as deadly as they are now. Or otherwise make them aim worse and maybe clearly show they are about to fire so the player can react in time!