Astro Tripper is a furious shoot-em-up experience inspired by the painful, knuckle busting video games of years gone by. An evolution of PomPom's 2001 award winning game, Space Tripper. Travel the surface of large horizontally-scrolling platforms, and pit your highly maneuverable craft against hoards of enemies eager to blow you to bits, eat you or worse.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.