Wow, what a great area to have access to. Great pictures and really nice music. The only thing which I'd change is the lengths of the shots. The were far too many 5 second grabs. A number of shots could have been allowed to run on and let us have a better chance of really seeing the landscape. Perhaps longer takes earlier in the video and getting shorter as the music comes to crescendo.
I spent more than 16 years shooting very little but 10 second grabs which gave the editor time to enter and exit a clip cleanly, this gave him the required 5 seconds or less. But shooting documentaries was a different kettle of fish, length then depended on the shot itself. Some of yours screamed MORE, but sadly it never happened. Also when the music is slow a dissolve or fade is better than stop/start. You can use that toward the end as the pace and volume steps up.
If I had to give a score I'd still be giving a 7 or 8 and compared to many videos on YouTube you did very nicely. If you have longer shots available I'd love to see a re-edit to include them. I hope I haven't upset you, please don't be, you did well, if it was one of first I'd say it was excellent, you certainly have an eye for it. The one big trait needed for this type of footage is a "feel" for it. An ability to have it flow and although it would be hard to do with the subject matter to try to tell a story, such as a journey from one place to another. Unfortunately over those 16 years I rarely had the opportunity although I certainly tried, but the news editor only wanted news, chop, chop, chop and my attempts were lost.
I'd definitely like to see more of your videos and don't forget to experiment. Take the same footage and re-edit it differently. What I used to do was watch the rough footage maybe a dozen times and form a sequence in my head or on paper, then do an edit to suit that idea. Believe me, it takes time to teach yourself when to stop and start whilst shooting, a long time, even longer to be able to edit in camera, but you'll get there, you have a head start. One small tip, try to have someone with you as a spotter. It's amazing what you can miss when you're looking through a viewfinder or have your eyes glued to a phone or tablet. My wife was my spotter and I'd often get a nudge and told something was happening where I wasn't looking. It gave me many unforgettable shots I would have missed if she wasn't there.
If you still have the raw footage and some spare time, I'd love to see another video. Congratulations and well done.