Not sure where the best place to put this is, but the download "tunnel_working_copy_4_24.html" is the working copy as of 4/24. It has, like, five times the text, so it's much, much bigger. The drawback is it hasn't been tested as extensively. However, the demo seems to have many game-breaking bugs at the moment, so that's not really a drawback in comparison.
If you want to give the game some extra time, I definitely recommend checking out the working copy.