Interesting concept. Nice visuals. I think controlling with a mouse is a little bit boring - a spaceship would've been cool! Also as others have said there's some bugs like sometimes the rings being too close to edges where the mouse doesn't reach.
By the way, this has since been fixed right after you tested (small fixes are allowed)
You added the spaceship?!?!
Nope! I just fixed the rings bug.
Maybe I'll make a V2 with a spaceship!
I was just kidding anyway. ;)