Way over in the big void of space live some aliens. They coveted [your planet] and would do anything to live there. So what's [your planet] to do? Yeah, blast through them all! Face off against waves of enemies, bosses, giant laser planets, blackholes, wormholes, massive lasers, planets and asteroids across 12 game modes! Everything is procedurally generated from the way YOU play the game! From attack patterns, strength of bosses and enemies, pacing between waves and generosity of bonuses! Features a comprehensive statistics system to let you hone your mad laser skills.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.