Hints
Fly to the top of the screen to avoid missiles.
Slow down on levels 8 and 17 to avoid rocks.
Go full speed to dodge infra-red missiles.

Codes
To activate the cheats type while playing: TOGETHER IN ELECTRIC DREAMS

Hit while playing the game:

<- go down a level> - Advance a level
G - Get more rockets
T - Takes away rockets
N - Get an extra life