Heya there Mousemonster,
First off, I really like how the tree in the middle is build, good job on that!
However, the jumps are quite repetitive, only a few head-hitters/ladder jumps here and there, but it's mostly only regular block jumps. Other than that, the course doesn't look appealing to the eye, there isn't much built and the platforms are pretty far away from each other. This way the theme isn't clear.
My advice, take a look at some courses on the parkour server and the way they're built. (Don't copy them though! Inspiration is however a good thing) Also, you can make a void using world edit. If you don't have access, there'll always be a player that can help you, just ask for it in chat. Most donators are willing to help as well, like me for example ^-^
Good luck on future courses, hope this helps!