Hello ShadowFlame2005,
Unfortunately, I will be
Rejecting your map.
The theme is unoriginal, as there are a lot of rainbow themed maps already, 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 build isn't great, it is quite small, and looks quite messy with the parkour around it.
The parkour is very repetitive. You mainly used normal blocks, with a few ladders and ice. I would recommend experimenting with a larger variety of blocks and items when building jumps, it will make your map overall more enjoyable to complete.
Almost all the parkour is floating. Please try to avoid having floating jumps when you can, and try to implement the jumps more into the build. Having majority of the jumps floating over the void makes the map look quite messy.
The difficulty suits a medium map, and the difficulty is too long for a hard map. Please read over this thread
https://manacube.com/threads/must-read-map-submission-information-format.649/ to make sure your map fits within the guidelines.
Thanks for submitting your map! I hope to see more maps from you in the future.