Hello i just created a map: type Sakura. Its a short little bit easy map 40+ jumps. Plot manisko, builder manisko and 0 helpers. I would give this map difficulty easy.
So the theme (islands) is taken, try to pick an original theme next time.
The parkour looks repetitive based off of blocks and ladders. I suggest you try to put more jump variation (link to what that is: https://manacube.com/threads/what-is-block-variation.64601/ ) in the parkour.
The parkour is floating, which unfortunately isn't accepted on ManaCube anymore. Try to put the parkour ON the build, not around it.
I'm not a map judge so my opinions won't affect your submission, this is just feedback. Good luck