Hey Sam, glad to tell you your map has been accepted!
The theme is kind of original as there's only one dropper with a similar theme, although that dropper is pretty similar to yours (Ocean). The build is good, it's detailed and attractive, and the animals are really cute.
The difficulty is good and matches the Hard difficulty; it's not too long and the water is spread out well around the bottom.
Thanks for submitting your map, I'd love to see more maps from you!