Okay lets go review time:
The theme is cute however I have seen a whale course before I think. You should check it out its by JustKevin on Medium.
The course is really short and I am not too sure how to do one of the ladder jumps.
There are alot of barriers on the top of the whale I don't know why.
I can see why there is barrier blocks with the water jumps maybe you want them world editing out to make floating water?
This course in my opinion is too short to be a medium and way too easy.
That said Good luck!