Roller Ball is my first release that utilizes Google Plus high scores and achievements. It is a free game you can download for your android device here.
You can also play a web-based versions (local high scores only, no achievements) right here.
Use ASDW or Arrow Keys to move, press escape to pause the game (Right Click for Full Screen Option).
While not too complicated if you would like to view the associated scripts you can find it here: Roller Ball Scripts.