Hello DreamSushi,
Unfortunately, I will be
Rejecting your map.
The theme isn't original, as there are already many rainbow themed maps. Please read over the document in this thread
https://manacube.com/threads/parkour-list-with-theme.20194/ to make sure your map idea is original. The main build is nice, but it is quite small, and the jumps sort of take away from the build.
The parkour is very repetitive, considering most of it is normal blocks, with a few extra fences. Try to experiment with a larger variety of blocks and items when building jumps, it will make your map overall more enjoyable to complete.
All of the parkour is floating. Try to avoid having jumps floating around the build and the void, having floating jumps can make the map look quite messy, so try to incorporate the parkour into the build where possible.
The length is good for a hard map, but the parkour is more suited to an easy/medium.
Just a small note, the map was at a different location to what you provided in your submission, not a big deal, just something to look out for in the future♡
Thanks for submitting your map! I hope to see more maps from you in the future.