Enable all cheats
During the game, type the following code: FILLITUPPLEASE.
Get a life
During the game, type the following code: LIFEPLEASE.
Get a shield
During the game, type the following code: SHIELDPLEASE.
Upgrade speed
During the game, type the following code: SPEEDPLEASE.
Upgrade
During the game, type the following code: UPGRADEPLEASE.
Get missiles
During the game, type the following code: MISSILESPLEASE.