Great feel of atmosphere and very well paced, for someone's 1st experience with ambiance I'd expect a much busier composition, furtunately you nailed it!
You used the wind samples very well, I've heard some others that weren't able to pull that off, and I do love a well used sample, but in this case, I see the amb track for a game, the wind FX will be there, what you need is something for the background to maintain atmosphere when its not, but not be the game atmosphere itself (hope I'm getting the point across well)
Great submission! Take care :3