Nice relaxing game. Gameplay and calm music left me wanting more!
I think the last stage bugged for me, as I did not create any civilization (not sure how yet - something to do with Aliens?), only entered the black hole looking thing and then it completed (went to "thanks 4 playing" level)
I like the sandbox gameplay - some more polish and a couple more objects added for variety and you could release it as some kind of puzzle game, or maybe just a pure sandbox.