None of these levels are impossible. Just be quick, and use the cutting off technique to quickly acquire the neutral zones and you'll eventually beat the game.
This game honestly isn't too good. It's got horrible control, the boats don't seem to break when they should, and the whale gets too big to fit with the small area you're stuck with.
I must know, what are the magical black things? Is it just a very dark colored block? Or is it something more...? *Ponders while stroking very few chin hairs*