Really like the surreal atmosphere this game creates. I could see the basic concept expanded upon to a search puzzle, where the enjoyment comes mainly from creative and absurd things to witness and interact with, as this bus above the clouds. I also liked the way I fell into the void after finding all gems, gave me a chuckle, as did the tank wildly spinning out of control into the void in my playthrough.
As a concept, I think this does have potential, I'd love to see how it could develop!