How do I slide up and down on android?

The controls still exist, and can be bound to things if desired, but I haven't come up with a compelling, simple control-set that implemented them without being too "busy" and overwhelming for the new user. So for the moment, Android leaves them unbound by default (unless you use a keyboard or some such).

two thumb-joystick circles, pitch and yaw on the right; slide up down on the left, tilt forward backward for accellerate/reverse.
rotate tablet left right for roll?

In my experience on a tablet, tilting is kind of a poor motion for something as fundamental as forward/reverse. Plus, it changes the angle of the screen, which is pretty problematic in combat.

I placed a higher priority on horizontal strafe (slide) and forward/reverse motion being accessible without changing the device aspect. On a 10" tablet I found the use of accelerometers for fundamental flight to be kind of unwieldy. They do work pretty well for things like rotate, though.