The answer to this one is somewhat disappointing. The atom ball can be unlocked after obtaining 236Q points. It takes a hell of a lot of work to make it this far and is the final thing that this game has to offer. Well the short answer is that you get nothing special at all. The ball does look pretty cool, but it does not do anything at all. Someone was kind enough to create a video of the final outcome which you can see here.
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