I just tested out your map and here are some things I have noticed.
1. The parkour is super repetitive, meaning that it's mainly just blocks, fences, and ladders. There is nothing really special about this. Try and add a variety of jumps. Ex: Heads, vines, chests, fences, etc.
2. I'm not really sure if the last jump is possible. The momentum you get off of the ice is barely enough to land on the slime and the slime doesn't even bounce you high enough to get to the end. Make sure you test your jumps and make sure they are 100% possible without speed before you submit.
Anyways good luck with your submission!