Infinite Lives
Current Rating: Not Rated
Fry until your ship is black instead of pink (it will either start playing automatically, or on the map screen, where you won't be visible because the background is black too). The number of lives will be random, and not change accordingly when you die. Eventually, your ship will revert to pink, and you'll have to use the other controller, but you'll still have unlimited lives.
If you fly long enough on the board where you have to kill all the enemies on the screen, you will automatically veer into a wall and the board will be finished. So you can play more or less forever.