The problem I have with Mountain is that once you've had the admittedly very personal experience of seeing your own little floating peak and bank of storm clouds come into being, and once you've squeezed every ounce of meaning or beauty from the proceedings, you're basically done.
The first time I opened up Mountain, I actually bothered to send a Facebook snapshot. The second time, I just rotated the mountain a few times, zoomed out and zoomed in again. By the third time, I'd opened the app accidentally.
Now, at my fourth use of the app, all I'm doing is bringing it up to someone who's curious and going "Well, yeah. It's a mountain. Floating in space. It's kinda zen, I guess."
And that's it. There's a bit of that old David Cage problem in there, in the sense that Mountain isn't really capable of wresting anything out of you after a few concurrent uses. At least it's subtle enough to avoid beating me over the head with a dead horse, all the while going "I'M TORTURING ELLEN PAGE IN A MOCAP SUIT FOR YOUR BENEFIT, YOU THANKLESS SWINE! FEEL FOR ME! EMOTE! CONNECT WITH FAKE ELLEN PAGE AND HER GHOST BUDDY! DO IT NOW!"