Cheats:

 Type these while playing:

 KMFDM       Backpack of Holding (full ammo)
 OMNI        Omniscience (reveal map)
 CHANNEL7    Godmode on/off
 BELFAST     Deathkiss (kill all enemies)
 RAVEN       Ambrosia (full health)
 BEAVIS      Get objective items. Only 100 points left to complete
             level.