Cheat:

 Type ???HOST??? as the password and you have the following codes:

 **uranus**   - Unlimited continues
 **saturn**   - View end movie
 Showcredit   - Show credits
 LAZYPLAYER   - All pickups
 GET SACKED   - Fight bosses only
 SHOWDROIDS   - Old intro movie
 NO MISSION   - Activates exit areas with out you needing to complete
                goals
 GRIMREAPER   - One shot kills
 2UNLIMITED   - Weapons upgrades won't run out
 INVINCIBLE   - God mode