Pressing [C] [0] [F10] down simultaneously will give you a full health and bombs. (Once per game)

Pressing [Tab]+[Del]+[F12] at once activates debug mode :

[F10] [G] - God mode
[F10] [W] - Warp
[F10] [M] - Display memory usage statistics

Command Line Parameter "apogee" will do all sorts of funny stuff.

The most important is : if you die quickly enough after entering a level, you'll be invincible from
then on, to everything but pits on the bottom of the level