DEMO version codes :

Wowie Weapons        motherlode
All Keys             currygoat
Invulnerable         zingermans
Lamer Cheat          gabbagabbahey
Accessories          alifalafel
Homing Missles       eatangelos
Bouncing Weapons     ericaanne
Full Map             joshuaakira
Level Warp           whammazoom
"Hi John!!!" (??)    pigfarmer
Dizziness            bittersweet