Hello golatyon,
Unfortunately, I will be
Rejecting your map.
The theme isn't original, as there are many maps already related to floating islands/biomes. Please refer to the document in this thread -
https://manacube.com/threads/parkour-list-with-theme.20194/ to make sure your map idea is original.
The build isn't bad. It's accurate to the theme, and does have some nice detail, so well done.
The parkour is quite repetitive, as a lot of it is normal blocks. it is good that you made a few different styles of jumps with them though, I would recommend experimenting with a larger variety of blocks and items when creating maps, as this will make your map overall more enjoyable to complete.
There were quite a few floating jumps. In the future, try to have one or two main builds, then incorporate the parkour into those, rather than having a lot of smaller builds, as having an excessive number of jumps floating over the build and void can sometimes make your map look a bit messy.
The length and difficulty are good for an easy map.
Thanks for submitting your map! I hope to see more maps from you in the future.