Pretty cool
This is a pretty cool twist on color matching puzzle games. At least I've never seen it done this way before. I think it might be a little to frantic at the start for some people but I had fun playing.
I guess my only real complaint would be that when you have a huge clump of the same color only a handful vanish when you click. I'm not saying your choice to only kill a small perimeter is bad, I'm just used to it in other puzzle games so it throws me off when I don't see the whole stack vanish.