Nice game you've got, It was a really simple idea yet fun and a bit of a challenge as well. Only things I'd say is it's missing some background music. And sometimes if the planets are on the 3 and 9 o'clock positions the arrows can easily come in from the side quickly ending your game (however the player can just counteract that by rotating 90 degrees) so that's not really that much of an issue.
I enjoyed playing it, good submission!