In either Challenge or Adventure mode open the 'Option' menu and type the following codes without the quotes to enable the corresponding. If the code has been entered correctly you will hear a confirmation sound.

Adds $100,000:
Type the code 'blingbling'.

Unlock Max Upgrades & 99 of ALL Items:
Type the code 'ntouchable'.

Refill Fuel:
Type the code 'fillerup'.

Upgrades Engine to next best Engine:
Type the code 'warp9'.

Upgrades Fuel Tank to next best Fuel Tank:
Type the code 'guzzle'.

Upgrades Cargo Bay to next best Cargo Bay:
Type the code 'supersize'.

Upgrades Radiator to next best Radiator:
Type the code 'toocool'.

Upgrades Drill to next best Drill:
Type the code 'digdug'.

Upgrades Hull to next best Hull:
Type the code 'penetrable'.

When you fly up to 5,000 feet above the ground you'll recieve a message along with some cash. If you fly up to 10,000 feet you will recieve a second message and get an angel that will follow you around and reduces ALL damage you take by 50%.

Go to the Options menu to type in the following codes to unlock the corresponding effect. If the codes have been entered correctly You'll hear a confirmation noise. Once you have entered a cheat you'll be labeled a cheater and you will not be able to submit your score.

Increases Hull Strength by 1:
Penetrable

Increases Drill Strength by 1:
Digdug

Increases Engine Strength by 1:
Warp9

Increases Radiator Strength by 1:
Toocool

Increases Fuel Tank Strength by 1:
Guzzle

Increases Bay Size Strength by 1:
Supersize

Adds $100,000 to Cash:
Blingbling

Refills Fuel:
Fillerup

Maximize ALL parts and give access the the core transporter (press 0):
Ntouchable