Looks great as it is, and the scene is very impressive, although I have a few suggestions.
Firstly I think faint clouds of dust being blown across the scene would add to the atmosphere, especially during the start and during the middle of video. I'd also add other sounds such as wind and maybe some birds.
Also I would have the monster at the end moving much faster, and shown much closer. At the moment it looks quite sluggish.
How it is now the scene feels quite static, and the audio feels disconnected from the scene.