Nice little game. a bit short but that's ok for a jam.
for feedbacks:
I couldn't tell if I was hitting the boss or not (maybe add a life bar or flash the boss red or any other way to give feedback to the player that he's doing what he's supposed to).
I didn't seem to need the jump at all, if a player input is not needed you should remove it, or maybe add some side attack that you need to jump to avoid.
For that kind of shooter there's not really any moment when you don't want to shoot. so auto-fire would have been more practical.
Appart from that, it's a cool game. Congratulation on submitting it :)