I think this is a cool puzzle concept. I've been thinking lately about 3d art that's only coherent from one viewing angle, and you've developed a game around this idea. Well done.
I had some difficulty controlling the spheres. I wish there were an obvious "tutorial" or README that explains how to rotate the spheres. Also, the background landscape was a bit blurry - it would have been nice to see a higher resolution image there. Nice job though!