TIPS: Use the normal stream of bullets more than the big ones. Make your only goal to make sure no meteors are heading for your base. If you see a shield power-up or the P power-up shaped like a rocket, get 'em. They're the most important. Don't get turrets, they only distract you and push the meteors the wrong way. For the very big meteor, use the normal stream of bullets, it works better. Plus, don't get the huge meteor out of the screen fast. It takes time, getting you closer to 600 seconds!