Could you possibly help us by putting in a ruler that marks the map coordinates? Yes, I can read the code to find where things are (or count), but there were a few times where it was somewhat inconvenient.
Thanks for the feedback! We've been thinking about doing that, but the challenge is making it inconspicuous enough to not clash with our minimalist aesthetic.
I've set up a mirror at: http://alexnisnevich.github.io/untrusted/
We're currently working on handling the AJAX responses more robustly. The level counter should no longer increment on a failed request.