Cool! I'm a total sucker for space related media. It's hard to not be overly critical since I love space so much and always want to see it done right. It was really amazing that you managed to make this in the time limit, especially in the browser. In an ideal world with a normal amount of time, it would be awesome to be able to make planets effect each others orbit, maybe even be able to make some of the smaller planets orbit the bigger ones like moons!