Wacky action/puzzlish thing that's really hard to get the hang of, but cool looking when it works. It's all about gravity and angular momentum... You hold down the mouse button in order to orbit the nearest star, and let go to fling yourself off in whatever direction you were going. Which takes some practice in order to figure out how to move around, and will make you blow up a lot while confused.
Some levels can be REALLY HARD, and while you can keep retrying as much as you want until you manage to make it work, the casual gamer in you might wish you could just sit back and enjoy the shiny lights more. :) It is groovy when it's going well.