Cheat Mode:
Type "ENGINEBYNEON" on the main menu. The screen flashes briefly and the following keys are active:

F1  : Full energy        F7  : End of Level 1
F2  : 20 lives           F8  : End of Level 2
F3  : All keys           F9  : Final battle
F4  : 900 time           F10 : Increase score
F6  : Less energy

Type "SMACKSAREGREAT" on the main menu to start with 6 lives.
Type "ILOVEKELLOGGS" for a music and SFX test.