Torpedoes At Night

You are a good alien. Control the movement of your ship by pressing the arrow keys. Fire a torpedo by pressing the "z" key. After a torpedo is launched, press the "x" key to detonate the torpedo. Hopefully the explosion will hit a bad alien and destroy it. While flying, consult your shield status and the count of enemies destroyed. If you destroy 30 ships you stop the assault, but if you get hit while your shields are destroyed, you will die.