I love this game. It is very challenging. For those who are stuck and unable to make a creature move forward, try creating a random creature with 5 nodes and then observe how it moves. Then try and use what you saw to build a better creature. That's how I figured it out.
 "How Smart Are You?"){kind=icon}
 "Walkinator"){kind=icon}
 "Furiosity"){kind=icon}
 "Learn to Fly"){kind=icon}