Pretty cool idea
It would be neat if there was a way to keep fighting if you run out of ammo at a large risk (like a melee, you can still fight but you'll probably die getting that close)
It feels kinda redundant to have no downsides to holding e to always collect bodies automatically; I'd say either make you unable to shoot while held or make you not need to hold the key down to collect bodies
It would be neat if the projectiles shot by the enemies could hurt other enemies or the one who shot them
Recoil gets extremely annoying when trying to stay on the bodies to pick them up
On some levels there are too many bullets available so with decent accuracy you can clear the level without ever collecting a body until the end