While in game press the "~" key to access the console. Type the codes there. Some codes have to be used again whenever you start a new level. Warning! If you use any codes the game will label your pilot as a cheater.

Effect	Code
4x weapon damage	power_to_the_people 1
Increases money by x amount	richman x
Instantly comple current stage	veni_vidi_vici
Invincibility	arnold_for_president 1
Ship has infinite cooling	keep_cool 1