The experience is truely stunning and I've always been facinated by your elegant utilization of particle emmitters. As for the critiques, I would say that despite how "gaseous" the game is meant to feel, I would still prefer to have some visual or audio response to guide me through the game. When I was first feeding gas clouds to my brown dwarf, due to the way the the particles are behind the star's sprite, I failed to notice that I missed the star slightly and the cloud was half-coverd by the star. I figured that out int a minuite but still, it was a bit frustrating. I would say having some response when the cloud is being dragged to the right place would've helped. Even an etheral "bop" sound or a simple ripple on the star would've helped, because an absence of response would automatically hint the play er that something is not done yet.