Build: The build is not very good as it's just a floating island with minimally detailed structures on it. Besides its unoriginality, the lack of properly detailed and shaped ground/trees/houses and lack of more enticing builds proves to make the build not very attractive.
Parkour: The PK was definitely short and easy enough for an easy map, I'll give you that. But, the parkour was all, if not mostly, fence jumps. You have to use a variety of jumps/blocks when making parkour so that it is fun to do and not repetitive such in this case.
I hope you take these criticisms into consideration when submitting maps in the future, good luck!