You wonder how to get a Gamebuino and make it work for the first time?
Examples are a good way to learn : understand how they work, tweak them, and then create you own game by reusing them.
Here you will find all the documentation about the Gamebuino library.
Everything about the programs you run on your Gamebuino is here.
Everything physical is in there. From the schematics to the layout to make your own case.
If you want your Gamebuino to do more, just plug the module you need.
If you weren't in time for the Indiegogo campaign but would like to play games and develop for Gamebuino anyway then try an emulator instead.