I love the atmosphere, the sound really makes it feel real, and thus gives it this eerie atmospheric feeling which I love and could get lost in just being there, not even playing. Not only the sound, but the theme, it just feels like a lost and abandoned sacred place. I love it.
There are a few flow issues I noticed, but nothing too bad. The bolder in the middle could also look a lot more realistic. I am not a fan of the item placement, but that is a personal opinion. I also agree with Doko that while it is very clean and professional, there is not a lot of creativity and originality, so that affects my rating. One more thing, I really like how you managed to add some blendmapping to the walls of the terrain, good job with that.
My rating is 6.5/10