Looks fantastic but it might be a bit too pretty for it's own good! It's very hard to get a bearing on which way is up with the heavily abstracted horizon.
Also I think you start way too low, if you added another hundred metres on or so you would still have the time pressure but at least enough time to open the book.
Basically it's beautiful, a fun idea and very well executed. I just think it does everything it tries to a bit too much!