Certainly one the most fun games I rated so far in the jam. The gameplay is tight and satisfying, speacialy because of the weapon upgrades. I also really liked the bosses.
As for some little nitpicks, I would remove the recoil from shooting and make the enemy sound effects a little less... harsh? I don't know if this was a problem in my end, but I thought they were a little harsh.
Overall, great work! Congrats :)