This was a cool idea, but I think the execution was a little imbalanced. I managed to avoid a couple 'X's and was hoping they'd just go away, but I think I had to hit them to progress. With that in mind, the strategy became just speeding up the circle and letting it go on its own for a while - I got to about 1000 before I called it. I think if you find a way around that you have a pretty interesting concept, though. There's definitely something in there. Presentation was great, too. Nice work!