Yep, I found the back window, got in, then climbed down the stairs and, not knowing how to climb back up, walked right into a grue and died. It was sort of fun to die this way in Grand Inquisitor, since it was visual to a point. But in the original game, just getting that text... makes you pretty sad.
Edit: I can't save in this, which I assume is the applet security blocking it as mentioned under the game. How exactly do I add it too my Trusted list so the game can save? I found the Trusted Certificates list, but I'm not sure what to enter.