I'm going to say the same thing as other comments, but the character get stuck to the walls too easily. For instance in level 2, I couldn't move yellow at all, no matter how many times I tried. It's also a bit annoying that the lines reset every thing you return to the planning, especially if two of your three characters had a perfect path.
However, the concept is really cool, I really want to see this one developped, with more polish. Great job!