CHEATS:
ownitup = Invincible
firepower = All Weapons
runforrestrun = Run Fast
rockedinface = Infinite Ammo
savemejebus = Low Friction
pwnagesince1337 = Double Damage

just keep jumping and moving around to not get hit

don't get hit and keep moving

Use this:
ownitup(Invincible)
firepower = All Weapons
runforrestrun(and run like a chetah)
rockedinface(Infinite Ammunition)
savemejebus(Low Friction)
pwnagesince1337(double damage guy)

Don't waste your ammo. It's stupud, use your piostol as much as you can.