Press ~ to enable the console and enter the following cheats:
Cheat.Heal(): 100 health
Cheat.GiveAmmo(): full ammo
Cheat.GiveRifle(): rifle
Cheat.GiveDynamite(): dynamite
Cheat.God(1): god mode on
Cheat.God(0): god mode off
Cheat.MagicAmmo(0): unlimited ammo and no reloading off
Cheat.MagicAmmo(1): unlimited ammo and no reloading on