Press E to pick up the gun. You have to press E again to equip it. space bar to shoot. I will add in more guns later. P to pause. W to move forward. the gun will pop up again, and when it does, it will give you a machine gun.
This was basically all me. Please post your best strategies in the comments. The Ammo count is only for the machine gun. Please report any bugs, or fixes that I need to do/fix. ---Updates--- I fixed a bug with the HP I made The high score variable Fixed bugs where zombies would spawn while it was paused