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