Hello ExoriumS,
Unfortunately, I will be
Rejecting your map.
The theme isn't original, there are quite a few maps related to biomes. Please refer to the document linked in this thread -
https://manacube.com/threads/parkour-list-with-theme.20194/ to make sure your map is original.
The build is accurate to the theme, but I would recommend trying to add a bit more detail as it does look quite simple.
The parkour has some variety, but some areas still feel quite repetitive. Try to experiment with a larger variety of blocks and items when building parkour, as well as the way you utilize these, as this will make your map more fun to play.
The difficulty is good for a medium map, but the length is far too long for a hard map.
Thanks for submitting your map! I hope to see more maps from you in the future.