WASD or arrow keys to move. Hold mouse to shoot. Press the "r" key to upgrade your health. Press the "c" key to upgrade your gun cooldown. Press the "z" key to upgrade your gun damage. The "Freeze" upgrade makes it, so when you hit an enemy, you have a chance to freeze them. The "Faster" upgrade makes it, so you shoot faster with your gun. The "Damage" upgrade makes it, so you do more damage with your gun. (per hit) The "LOW% KO" upgrade makes it, so when you hit an enemy, you have a chance to KO them in one shot. The "Slower" upgrade makes it, so that the enemies move slower. The "+1" upgrade makes it, so you shoot an extra bullet. If you get a movement glitch (moving endlessly in one direction without any keys pressed), reload the page or sometimes, just moving in the direction you were moving with the same key that you were moving with also works.
Credits to: Ammo fever (that cool game)
