Really nice game! The screen froze during one of the fade-to-black transitions (I realized that I hadn't gotten everything I needed out of the first stage and went back through the portal) so I couldn't finish it. But the game itself was really nicely executed.
Great game. Level 6 has a bug: If you break the topmost chunk of wall and kick the ball over the goal the AI will hop on top of the wall and start jumping up and down over and over trying to get the ball. The ball never comes down, so you're just stuck.