First time through, I got used to the attractive, repulsive, and size effects. Now Im seeing how little I have to manipulate things to get the desired effect. Lovely game. I wonder how many future rocket scientists are playing it now?
How about continuing the game by starting a sparkle off from the source with a set amount of fuel, a goal planet, and, say, 8 planets with various gravitational wells orbiting a sun?
NCCdoc about Breath of Light : Relaxing Puzzler, v1.0.1547