[goofyballer]

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I don't really get the point of those little star thingys you collect. I know you can shoot enemies with them and so far you've needed to feed them to certain things, but at one point the game recommend I save a few? how do do that?

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Lumas pop up in the Comet Observatory that require Star Bits to feed; when you feed them, they'll transform into small galaxies you can go to. IIRC I've unlocked three so far, which required 400/400/600 star bits to feed.

When you get a star in a galaxy, all the star bits you got in that mission are added to your total.