good
Its visually good, its way better than the 2 classic bars. Just continue working on the script, the computer player sometimes gets stuck till the ball goes no more and the game cannot be played anymore.
By the way, the earth and the moon are a good detail, maybe both should rotate but very slow. Only the earth moving attracts attention to the left and I'm not sure if that's what you want, but if it is, then let it as it is, maybe you could only work a little on it and give it some more detail. You could actually make a circle whici _rotation changes a bit each frame to make an "eye candy".
Whatever, keep going, if this is your first game, your're doing it well.