This is absolutely brilliant, love the way the puzzles work, as well as the visualization, i think if the line updated in real time as you write would be a tiny bit less of a challenge, but would be a major quality of life improvement. The puzzles are neat, i love games that let you figure out the rules on your own such as Taiji or The Witness, and it was done beautifully here. I'd be super excited about a full release of this, it's a great idea executed amazingly!