Just wow!
There's so much in here that it's staggering. This feels more like a vertical slice for a full game, than something that was made for a jam in just two weeks.
Everything from the art, to the sound and gameplay is all on point. I really can't find any areas to critique, I only want to see more.
Maybe more weapons to provide a bit more variety to combat (big cannons that you need to stop for a second in order to fire, melee weapons with combo hits). But this stuff would, of course, only be if you were all going to continue to work on this, which I really hope you do.
I can totally see this becoming a commercial game, 10/10!