It may have taken me forever to finally beat level 5, but the satisfaction of it all smoothly working was so satisfying. I'd say the only thing to improve is to put at least some tutorial (on the controls) somewhere, it took me a until the last level to have a proper grasp of how to click to draw lines and place stuff. Awesome game in any case, and the fact I did eventually get the controls shows how well made the learning curve is.