Blocked view from a bird that could pick you up too early and cause you to skip some puzzles.

Changed the starting position for a bird that sometimes caused a problem. I'm hoping that I've managed to eliminate this without causing a new problem! Also some visual changes, including thicker platforms and a barrier at the beginning to stop you from walking into the invisible wall. You can still walk into it at the end but that's what you get for trying to go the wrong way when you are so close to the exit!