Hybris

Cheat Codes:
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Load the game and wait until the high score screen appears.
Type commander and press Fire. Wait approximately two 
seconds and press [F10] to enable cheat mode. Your ship will 
flicker to confirm correct code entry. During cheat mode, 
your ship will be invincible, and have unlimited expansions 
and smart bombs. Additionally, one of the following keys may  
be pressed to activate the corresponding cheat function. 

High score will not be recorded while cheat mode is enabled.

Effect                          Key 
-------------------------------------------
Other six levels of expansion   [F1] - [F5]  
Level skip                      [F8] 
Toggle cheat mode               [F10]