Version 0.2.2

Added a few more levels. What's important is that I added the "color changer." When you push a box on it, the box changes color in a predictable cycle. Only 3 changer levels for now, but I'll add more later. Also, I moved around a lot of the levels - at the moment I feel it takes too long to introduce some of these later elements. It's still probably too long, but at least you don't wait nearly 20 levels just for one-way walls.