Level Select
Put this cheat in as your name: !EVAH!

Invincibility 
Put this cheat in as a name: B4K42.

Get All Bonuses
Put this cheat in as your name: 105770Y2.

Multiple codes:
Start a new game and enter more than one code together to activate each of them 
simultaneously. For example, enter B4K42105770Y2 as a case-sensitive name. 

Jet mode:
The weapons in Jet mode are considerably less effective that the weapons in 
Walker mode. Couple this with the fact that Jet mode does not allow the Shield to 
generate. Only use Jet mode when you need to blow something up or kill a Fighter 
(or any other air units such as bombers, landers, etc.) in the air. Stay on your side 
of the battle, as it will be nice to have a helping hand when things get rough. Try 
not to use all your energy while in Jet mode; when you land you will have no 
shield. Repair Pads are your friends -- use them.

Fast Safe Landing 
Land quickly and efficiently without using retros or taking too much damage simply 
by aiming Aquila's nose straight down and "flying" into the ground. Once Aquila is 
touching the ground in Jet Mode, it will force stall and change into Walker Mode 
once more (or you can change form manually).