I really liked how failing the puzzle didn't automatically make you lose, but it just made the next part harder. If I were to make a recommendation, it would be to make the later puzzles a bit tougher. As it is, the later puzzles were the same as the earlier ones, except the wires overlapped slightly more. I found myself just waiting out the timer after solving the puzzle quickly. Maybe the later puzzles could add more nodes to correctly connect or something? Also, it wasn't clearly explained what to actually do to solve the puzzles. I was pressing every key and clicking on everything before I figured out that you had to click and drag the symbols.
So yeah, sweet game, just maybe make it progressively harder, and make the instructions a bit clearer. =)