I thought this song was put together very well. It felt very atmospheric, the pacing was great and I loved the little attentions to detail such as the little sound effects in the background. I really felt like I was being taken on an adventure through out the song.
I did find a few problem with it, for example I thought the climaxes were cut a bit short, and the part after the first climax felt kind of remote from the rest of the song.
Nevertheless, it was a pleasant experience, and I would definitely recommend this song.