I'm actually using an Arcade1Up cab that has an Android tablet built-in. I know that the joystick maps the same as an OUYA controller because I've tried OUYA games on it and they work fine. But for whatever reason the joystick doesn't register at all with this game.
Update: I did a little more investigating and turns out the joystick maps to a d-pad. Does your game support the d-pad?