Hello harrisongamez,
Unfortunately, I will be
Rejecting your map.
The theme isn't original, as there are many biome themed maps already. 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 great, as it is mainly floating islands. Try to have one or two main bigger builds as your map, and incorporate the parkour into that, rather than having many small floating islands.
The parkour has some variety which is good, however it did feel a bit repetitive, considering you did have a lot of normal blocks as jumps, try to experiment with a larger variety of blocks and items, and mix them up more throughout your map, as this will make it more enjoyable to complete.
Almost all of the parkour is floating. Try to avoid having too many jumps floating above the void where possible, as having a lot of floating jumps can make your map look quite messy.
The length and difficulty are good for a medium map.
Thanks for submitting your map! I hope to see more maps from you in the future.