You're strapped in your laser ship, battling fierce Deltoids and Shields. They approach in waves, at faster and faster speeds. Each raider can shoot a single flash of proton energy that comes at you like a lightning bolt.
There's no time to waste. And no place to hide. Then, as you carry on the defense, things get much worse. A far-off sun explodes! Fragments from the cataclysm come raining down. Keep moving!
Blast almost everything you see! If you don't, heat from the solar debris can destroy your planet. If you prevail, you can move out to the edge of space and attack your foes. Sweet revenge!