On Valve Index, can't turn. Touchpads and joystick do the same things, left hand being move and right hand being eject clip and safety. Just dropped a full clip because of this and it clipped straight through the floor as best as I can tell.
And after a bit more playing, I accidentally dropped my gun through the floor as well. Still a very nice adaptation of Receiver for VR, mind. A bit too difficult for me, really, especially the drones.