Same thing, new color.
I mean duh. First of, I suggest instead of two different spots, create a small little menu that drops down when you hover over it, and then have like a thousand colors. All sorts of colors and shades. Green and silver is not ok. They are only 2 colors. Add hundreds of new colors. Add backgrounds on a separate menu. Hundreds and thousands of backgrounds and colors. Add the option of a second or tenth ball, and different sizes. Like I want to have a giant red ball desetroy forty small green ones. Add objects to throw in there. So the balls will bounce off of them. Now, yes I did carry on a little much with the amount of new content you need, but a re-release with ONE NEW -COLOR- does not merit a completely new release. I ESPECIALLY doesnt mean sequel! Now... That kind of annoyed me, but its ok, if your gonna make another, add LOADS of content, and not just one little color.