Cool art and I liked the concept. I'd just recommend adjusting the colliders to help the player a little bit, because I felt that some of the levels demands some level of precision that, for a game where the planet gravitation is the main controller, feels a little too rough. Also, I've been having some problems to keep scrolling the planets, but isn't like my mouse is the best one, so it could be a "me" problem. Overall, interesting gameplay and it's a good way to unconsciously teach people about gravitational force. Good job :D