Hello AroZilla,
Unfortunately, I will be
Rejecting your map.
As Hayley mentioned, the theme is unoriginal. There are a lot of ocean/aquatic themed maps, with a seatemple map already (
SeaTemple - Hard) I would recommend checking the document linked in this thread -
https://manacube.com/threads/parkour-list-with-theme.20194/ to make sure your map idea is original.
The build isn't great, it feels quite plain, try to add more shape and depth to your build, as well as detail, this will make it overall more appealing.
The parkour is very repetitive, as it's mainly single blocks and ladders. Try to experiment with a larger variety of blocks and items, as well as the way you utilise these, to make your map more enjoyable to complete.
Try to avoid using a significant number of barriers in your map/build, some to block skips are okay, but for this map in particular, there were a lot of them which made the map a bit confusing/messy at times. When building parkour, try to build it in a way that you can prevent skips in the first place to avoid using a lot of barriers.
The length/difficulty are good for an easy map.
Thanks for submitting your map! I hope to see more maps from you in the future.