Trizons

Your planet is under attack by Trizon forces and you are the last of a huge fleet to protect your planet by blasting as many of the invaders in your craft over various levels. The game is a horizontal scrolling shooter viewed from an elevated angle and you must blast as many aliens coming from the right of the screen before an energy gauge runs out. Next to your energy gauge is a Triz Force gauge and to complete a level you must blast the aliens to fill it to the right, if any alien goes past you then the gauge moves to the left. If you touch an alien, it's bullets or allow too many aliens to pass you then you lose one of five lives.