Quite tricky
Despite the fact that the opposing circles are moving in a relative pattern, you need a good deal of skill to avoid them for very long.
I think that you need to break it down into levels (If you have and I haven't managed to exploit that feature, you have my apologies), where you get different patterns of moving items - not necessarily circles, as it shouldn't just be that to perplex people.
The other thing is that the graphics aren't too spectacular, but they need to be spruced up a little to add something to any future productions that you make.
I'd also suggest a little music, as it's quite a boring little affair without that at present.
Boring on the lack of music front, but very skillfull in the gameplay stakes.
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