Hey porkypine and Cam, sorry to tell you your map has been rejected.
The parkour is decent, it's varied and fun but pretty easy for an Expert imo, it would probably fit better as a Hard. The build isn't great, since all the mobs were made by someone else, and the islands they're on are kinda plain. The theme is also unoriginal, since the map is a mix of floating islands and Minecraft mobs, both of which are very unoriginal.
Thanks for submitting, I'd love to see more maps from you guys!