Hello MagicMysteryGuy,
Unfortunately, I will be Rejecting your map.
The theme is original, and the build is accurate to the theme. I would just suggest trying to add a bit more detail to the build where possible, I do understand though it is difficult to add too much to this considering the nature of the theme, but it does look quite plain.
The parkour has some variety, however you did group some of the jumps at times. What I mean by this, is that you would have a sequence of just ladders, then just iron bars etc. Try to maintain having the jumps more varied throughout the whole map, this will make your map more enjoyable to complete.
A lot of the parkour is floating. Try to avoid having an excessive number of jumps floating over the void and instead have them incorporated into the build more, as having 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.