Super Mustache is a vintage styled platformer, filled to the brim with 8 bit pixel art juice! Join Captain Super Mustache in a journey to save the planet Uranus. If you enjoyed classic platformer games from the golden era of video games, then you’re going to love this.
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.