Thank you Stanisrawr. There's a clue in the first scene that will tell you which obelisk to choose. Also, in the Cardboard version click to toggle movement.
Hi Punchey, so far I've only run it on various Samsungs, S5/S6/S6Edge. Do you have a different make/model? I'll give it a look in the meantime but I'm such a noob that I don't know if I'll be able to fix it.