If you are searching for a simple, entertaining Windows Phone game to waste the time with you need to give Beyond Gravity a try.
It does have an endless runner feel to it but you do more jumping than running. The goal is to jump through space, from planet to planet, collecting nuts and bolts along the way.
The Samurai Jack graphics look great, the game play challenging and overall Beyond Gravity is a Windows Phone game you gotta try. It lacks a trial version but on the brighter side of the coin, Beyond Gravity is available for low-memory devices.