The laws of physics seem to not exist in this level.
The pond shouldn't run up the side of the slopey hill. Even though, conceivably, it could happen in real life, the geography of the level is unlikely. I would sandify the top of the lake.
I also agree that some of the water should be straight, but not all of it. It should be unpredictable, not all bendy.
EDIT: I before E except after C.
