i just played this and i'm a big fan and i love the gun controls
i do think that bullets should be a bit more common since sometimes you can get really low on certain kinds of bullets and also for some reason you can't pick up the ammo boxes when you're at max ammo even though you can unload weapons when your ammo is full and it works perfectly fine
also i think that the button for aiming the right barrel of the double barrel should be something like V instead of right shift since normally you'd have one hand on the movement keys and the other hand on the mouse and the right shift is way too far away to hit quickly