While not the most innovative gameplay concept, this could have worked. However, it doesn't seem that anything happens once the planets spawned, or it takes so long that one will lose interest. I let the sun die after >2000 points because it seemed there wasn't anything else coming anymore.
There seems to be no sound either, which may help keep players hooked a bit longer.
Add more to do and see so there to keep people playing, I'll gladly come back and check it out (after the jam, obviously)