If you want to finish a game, you need to cut the complexity and the features. Get out your red pen and/or machete, and follow along:

Now where are we? We have a ball, floating in midair; a ball that can't hit the floor. So, we need something simple to hit the ball with. A human character is too complicated, so let's just say it's a surface. We'll have some kind of thing that we can bounce the ball on.