Thanks for playing!
I hate this bug! It's only present on web build, and as far as I gathered it happens when resizing the screen, but only sometimes.
As for the recoil. The weapons in the game were to designed to be distinct. So you have a pistol, with no recoil but slow rate of fire, and mid damage. Uzis and shotgun, both have bigger recoil, but uzis have rapid fire, and shotgun's got tons of ammo. Last two weapons also have no recoil, but bullets move slower, so aiming it right takes a bit more skill (especially at ninjas).
Being hit, and not registering, was reported to me by two people by far (one during jam, one during development), but I haven't been able to replicate that on my machine.
Once again, thanks for playing and glad you liked it!