It looks great but the puzzels are a bit annoying. The radder however created some tension and even though I later discovered that I had all the time in the world, I had the feeling it needed to be done quick and precise.
Thanks for your feedback! That feeling of precision and speed was definitely the aim. I'm wondering now if there should be a global timer (i.e. complete all puzzles in 20 minutes), because you can definitely sit back and relax on the sonar puzzle.