Hey EwoutCookies, sorry to tell you your map has been rejected.
The theme is original and the build is attractive, good job! However the main problem is the parkour: a lot of it is floating, which distracts from the build. Try to incorporate the parkour more into the build in your further maps. It's also kind of repetitive, make sure you're using lots of different types of jumps (ice, glass panes, etc.) There are also a lot of barriers, which can make the parkour confusing. Try only to use barriers when you really need to, and if you do please mark them with signs or item frames. We also found that the parkour was a bit long for an Easy.
Because the build and theme are good, we recommend fixing the parkour and submitting this map again!
Thanks for submitting, we'd love to see more maps from you!