Used to be, as a kid, that one of the easiest, cheapest entertainments was to ruin around with arms outstretched, pretending to be an airplane. Of course, kids also used to play Mr. Potato Head with actual potatoes - businesses love to find a way to monetize our imaginations.
So now you have Cult of the Wind, a video game in which you run around with arms outstretched pretending to be a plane. I'm guessing the real reason Hayao Miyazaki retired is that he heard about this and plans never to leave the house again.
One caveat: it does have to be upvoted on Steam Greenlight first.
h/t SlyDante777 via Destructoid