Build: Personally, I don't think the build is very good. It's just floating leaves and trees. There's no focus on this map, no eye-catching central build. It just looks like a mess, really. Remember that you have to create a central build that portrays your theme accurately, not a bunch of different things all jumbled together.
Parkour: The parkour fits the easy difficulty in both length and ease. But, I just didn't find it enjoyable to do. It was a bunch of the same jumps over and over again (leaves to leaves and some ladders here and there). You need to be more creative when making parkour, don't be afraid to use a bunch of different jumps/blocks!
I hope you take these criticisms into consideration when submitting maps in the future, good luck!