Use the following cheats after you go to the options screen and then to the cheat function. Combine the column of words to spell a single long word as described below.
Dismemberment: INSANEGIBSMODEGOOD
Fill Bloodlust: ANGRYXXXINSANEHOOKER
Enemies Freeze: DONTFARTONOSCAR
Invincibility: TRIASSASSINDONTDIE
Top Off Health: LAMEYANKEEDONTFEED
Show Weapons: SHOWMEMYWEAPONS
Time Factor: NAKEDNASTYDISHWASHERDANCE