M.D.K.

Press F1 to activate the cheats (can only be entered once per stage):
HEALME: Full health
HOLOKURTISFUN  : Decoy increase
ILIKETOLOB     : Mortar gun increase
INEEDABIGGUN   : Gatt gun increase
KILL           : Suicide
MAKEMEFULL     : Health increase
MASTERBLASTER  : Gatt powerup
NASTYSHOTTHANKS: Homing sniper grenade gun increase
TORNADOAWAY    : Twister gun increase
TWISTANDSHOUT  : Tornado