Hello flal1,
Unfortunately, I will be
Rejecting your map.
The theme isn't original, as there are already a few maps based around the castle theme. I would recommend reading the document linked in this thread
https://manacube.com/threads/parkour-list-with-theme.20194/ to make sure your map idea is original.
The build is good, it's simple but has a good amount of detail, and fits the theme.
The parkour is quite repetitive. There are a lot of sections that have mainly normal blocks, ladders and fences. I would suggest experimenting with a larger variety of blocks and items when building jumps, it will make your map overall more enjoyable to complete.
There are a lot of floating jumps. Please try to implement the parkour more into the build, rather than having it float over the void and around the build, this can make the map look quite messy.
The length is good for a hard map, and the difficulty suits a medium with a couple hard difficulty jumps.
Thanks for submitting your map! I hope to see more maps from you in the future.