We release v0.6 yesterday to clear up a ForceClose which was occurring when all of the tanks had been destroyed including the player tank. The camera had nothing to look at so was complaining ;)
We've also varied the height of points along the floor to cause a pleasant looking undulation.

Some people are complaining about control issues. In general this is something I'm concerned about as it's quite hard for the game to determine whether the user has calibrated the orientation sensor or not. Perhaps we need a calibration tutorial which runs on startup.