It does not seem to happen all the time. This is, in fact, the only time I've ever seen it happen. Anyone know why?

I was thinking perhaps it has to do with how you light up all the stars? Do a perfect spiral perhaps? I still have not seen this myself.

This has happened to me-only once though i did a PERFECT spiral.

You did it perfect! :)

Cool! I hadn't even realized that was a thing! (Radial Heights is one of my favorite upgrade minigames, so hopefully I'll see it again at some point!)