That's really nice and simple. Love the design! So clean. The use of a pie-chart (or donut chart really) is very nice, but it is a bit difficult to read. I like it better than bar charts from an aesthetic perspective, but I think it is more difficult to get a perspective of scale.
I would recommend finding a way to add % numbers to help people get a better grasp of the results.<p>Also, blue/green and particularly the shades you chose don't work well in your implementation, I don't think. The green doesn't shout Yes, you have to think about it, and blue has never been no. Also I believe blue/green color blindness is the most common, therefore many people wouldn't be able to tell which was which on your chart.<p>Really a great run, just a bit of refinement I think!