Build: I'm really not a fan of the build as it's just floating islands with no originality, focus, or detail. It's just all not very appealing to the eyes due to the lack of proper execution of the aforementioned. The islands just have odd shapes and minimal/effortless things on them. I know you can do better.
Parkour: The parkour definitely fit the easy difficulty, it was easy and short. But, that doesn't mean it was very good. I say this because it felt very repetitive to do as you didn't utilize a wide variety of jumps/blocks. It was just a lot of ladders. That wasn't very enjoyable to do. Think of expanding your variety in the future to prevent such linearity.
I hope you take these criticisms into consideration when submitting maps in the future, good luck!