Really awesome game. I think I know where the idea is coming from ;) Love your implementation with planets. The continues movement of the planets looks good, but can be really punishing if one of your ballz is stuck behind and is not coming back while all planets get closer. Maybe some way of shooting without all your ballz being at the line would be a nice idea. Also the repositioning of the ballz is a little annoying, because they get moved to the position of the last ball hitting the line. Here I would really like to see the way the original game is doing it with keeping the position of the first ball hitting the line, so that you know the position and can already start to aim.
Other than that the graphics and animation are really awesome and look alive. The music is also good, but the soundtrack is not from yourself.