I think this has the potential to become a very addictive game, but the overall concept needs a bit more refinement.
Here's what I would do:
Make the graphics more true to life
Make the backstory a plane crash in the clouds.
Debris is raining down, and you must doge it. (Debris acts as the circle )
You collect various part to construct a glider (Mimicking the way the people link together)
If you hit a piece of debris, your gilder will lose those pieces.
That would be my approach!
Regardless, good concept!