I really love weird transcendental existential end-of-the-world games like this. It reminds me of Terranigma. So beautiful. The music and visuals are both simultaneously simple and overwhelming. I just want to drown in this game.
I got stuck on the cave level when I jumped through the roof of the plane and so couldn't get to the door: http://imageshack.us/photo/my-images/
18/manwhosoldtheworld.jpg/
It would've been cool if you could just land in the cave after doing that. But I guess the plane hadn't reached it yet. I'm glad I figured out you can go back to the menu by pressing escape.
I got all 9 pieces of eternity and I don't know what they did. I got all 4 endings after collecting them. How do you get the last medal? I went through all the comments looking for answers and didn't find any.