Any developer can sign up and upload their games to the store. Pricing for games starts at
free of charge and can go up from there. Once the game has been made available in the
store, any user with an account can purchase it. All games and apps are stored under the
/usr/local/bin/indiecity folder to play them offline.
Don't worry about formatting your SD card and losing your games. When you log in to
your Pi Store account you can re-download all your purchases.