During play, engage the 'CAPS LOCK' and type "FTBOK". If that doesn't work try "ACID".
Now you can use the following keys:
'1-5'-------Weapon select | 'D'-----------Screen dump/die
'6'----------Faster speed | 'C'-Clear last enemy of stage
'7'----------Slower speed | 'R'-------------------Restart
'8'-----------------Lives | 'H'----------------------????
'9'-------------Beta suit | 'L'---------Add 100k to score
'T'------------Game stats | 'I'----------------------Menu
'X AND 0-9'-----Set stage | 'Q'-----------Quit to desktop
'K'--------Kill off enemy