Heyo! I'm glad that you've decided to try your hand at map making! Here are my thoughts on this map;
THEME:
The theme seems somewhat original, however, there are still some maps that partially use this theme of going through areas or a world. (E.G Biomes)
BUILD:
Honestly, the build feels quite small. It doesn't feel like it's been given thought, but rather it feels like several maps have just been squashed together. The end of the map also feels very different from the rest of the map. I also found it hard to find the start and end of the map, as the build felt very circular and compact, and had no defining start or end (just a side-note, it's always good to have a spawn area with crediting to the builders and some information about the map for the beginning and a pressure plate with wool corresponding to the difficulty to mark the end).
PARKOUR:
I'm not quite sure how to talk about your parkour. Whilst the beginning of the map has somewhat decent parkour, the end of the map makes you go through a tunnel of water and just hop over a couple of pools. Not to mention you can skip the majority of the map from the very start! Half of the parkour is floating, which is okay, but it's always best to avoid floating parkour as much as possible! The parkour, in general, feels very easy and short, with no real challenges.
Overall, the parkour and the build feel very lacklustre and the map overall feels somewhat rushed. If you were to go back and change a few things (patching skips, removing floating parkour, etc.), as well as polish up the build and parkour, I'm sure you could have a good map on your hands! Good luck in your future maps!