The build is decent, although it could definitely be improved (low block variation, very simple/blocky shape, random sphere as Hira said).
The theme is nice and original, and I think it's very nice, almost like an adventure map.
The parkour is the main issue, at least for me. I found it very fun, but it was too easy for a hard, and it was pretty repetitive (try adding fences/walls, ice, soul sand, heads, etc)
Overall, +0. I think it's a great start, and you have a lot of mapmaking potential, but try to practice building/making parkour a bit. Good luck!
Keep in mind, I am not an official map judge; take my review as that of a normal member of the community <3