Hello FilmReel,
Unfortunately, I will be
Rejecting your map.
The theme isn't original, as there are many rainbow themed maps already. Please refer to 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 quite flat, so I would recommend trying to add more shape and depth, it is accurate to the theme though.
The parkour is very repetitive, as you mainly used normal blocks and ladders. Try to experiment with a larger variety of blocks and items when building parkour, as well as the way you utilize these, as this will make your map overall more enjoyable to complete.
The length is good for a medium map, and the difficulty is good for an easy map.
Thanks for submitting your map! I hope to see more maps from you in the future.