Hi there Moang,
Im sorry to tell you your map is being rejected.
The THEME is unoriginal as we already have maps based on coasts (Tsunami) .
The BUILD is does have great texture and detail, so good job on that! The water at the top of your map does interfere with the parkour and makes it less enjoyable as it is a pain to get out of!
The PARKOUR does fit the length and the difficulty of a medium map. Your parkour is lacking variance, the only things that are incorporated are regular jumps, ladders and fences. To add more variance, try adding more jumps with unique blocks like pots, water, heads, vines, etc. The pathing of your is slightly confusing so try to add directional signs/heads to make the pathway clearer.
Thank you for your submission, hope to see more from you ! Have a wonderful day.[Hayley]
-Ana