Hello!
Sadly, your theme is unoriginal as we have maps based around this theme
Your map needs to have a main build/island as it is all floating parkour, which isn't allowed. Adding this island will allow you to add the detail and texture that your map is missing and have a parkour pathway around the build, which will look less messy.
With regards to the parkour, it is too easy for a medium map. Use some of our implemented medium maps to help you with the difficulty. Try having more block variance as there are only ladders and regular jumps. You can use blocks such as heads, plat pots, cactus , ice etc.
I hope this helps! c;