Cool little game! Would love to see it expanded upon.
The shooting and killing enemies feels good, however, I feel like the feedback from shooting (camera shake and white flash) are a little bit too strong for when you miss. Right now, if you miss or hit, it feels the exact same, diminishing the satisfaction of the screenshake and white flash when you do hit an enemy. I think simply lowering the strength of the screenshake and whiteflash when you miss would drastically improve the feel of shooting, as everything else feels spot on. Perhpas a different sound effect for when you miss vs when you hit as well?
I love the artwork across the whole, albeit I reckon the in game levels are completed, but that's to be expected in a jam.
I think with some more time and polish this could be a fantastic shooter, especially with the mechanic of rolling into the enemy to pick up their weapon and to reset health (quite easy to die in that state tho). I loved that to die, you needed to lose your gun AND get hit 3 separate times, this felt really good to play with, and made me be careful to not rush into full rooms of enemies.
Overall, well done!