How do i make a ball behavior on a mobile device

How do i make a ball on a mobile device that moves depends on a turn (acccelerator)?

for example, this way - don't work:

please help

may be it unpossible with c2

And i want ask founders of c2 how degrees can be with negativ valuies ???

"Gamma is the device left-to-right tilt in degrees (i.e. twisting if holding in front of you). A positive value indicates right tilt and a negative value indicates left tilt."