As the game says – you are mountain, you are god. However, that's pretty much all it says. MOUNTAIN is a procedurally generated ambient game where you interact with a floating mountain hanging in space. While observing, you'll find objects which can be collected and organized, but I'm not sure why.
Have you ever wanted to scale a giant mountain? It's a really cool thing to do that challenges you to reach your peak physical condition, invest heavily in gear, and the payoff is joining a tiny percentage of the population that can say they've seen the world from one of its highest points. Or you could just go to Google Maps, now that the company has added images taken from the peaks of the Seven Summits, the highest mountains on each of the seven continents.