Various cheats

Type in any menu:

"bubbles" - Enables cheats.
 
"thefullmonty"  -  Turns on level switch capability, use menus to pick
any level.
 
"iamzeus"  -  God  mode.  Invulnerable, full weapons, unlimited ammo &
nitro, 4 powerpods, 2 unknown weapons "SPID" and "THIEF" eyeballs.

"titsoot"  -  If  you  have  access  to the special ship, turns on the
"adult" textures.
 
"lumberjack"  -  This turns on a missile toggle. Hitting quick key for
Mug  selects  normal,  hit  Mug again for spiraling Mug, once more for
bouncy-Mug.  (2 bounces) Hitting quick key for Solaris selects normal,
once  more for homing plasma like the turrets use, once more for extra
powerful blue homing plasma.
 
"jimbeam"  -  This  turns  on the beam toggle. Hitting laser quick key
selects  normal  laser.  once more for electro-beam like LevTank. once
more for superbeam from hades.