While the game is very simple, somehow it sounds like something i want to play right now. Perhaps exactly because of that, since I can already see it is going to be nice 10 minute distraction. Also, instantly when you said he is climbing up the mountain, it sounded like something interesting, something different from rest of the games where idea is to drive a car, kill zombies or any other regular stuff. Climbing up a mountain, that is not so usual topic in games, especially nowadays. In early 90s and before there was even mountain climbing simulator, and before that some where you were climbing up apartment building wall, but after that, I dont remember seeing this topic at all anymore.
Also, what comes to mountain climbing, it is also easy to have it parallel as reaching towards God, as you are reaching high.