i absolutely adore this game. gameplay wise it's really solid arcade fun. i think the main reason it works is because of the growing radius, there's a sort of risk vs reward with how long you're willing to wait before dodging the planets. the planets btw really remind me of the pacman ghosts, which is a good thing. collecting stars feels great too.
the game does get old after a while though, and there's not much of a difficulty curve.
the audio is ok, but i don't think the music fits the tone very well..
i agree with Raea, i think if you polished it a bit then this could do really well on mobiles.