Super fun, I enjoyed almost everything about this game, but there is one thing I'd suggest; when you throw your gun, you are restricted by its trajectory until you catch it. Making it maintain your sideways momentum means that you wouldn't have to stop in the middle of combat to do this, and could keep strafing around the enemy to avoid its shots, as long as you don't change direction.
Awesome game, I'll definitely be watching Jelly Brain closely to see what you do next.