Interesting.
I am seriously considering to make a game around this theme. It sure sounds like a challenge. In fact, I should really do it, as I never entered any of your challenges, one way or another.
P.S. About 15 years ago, my Mini DV cam stopped working. It only recorded sound from that moment onwards. I was close to make a movie with just darkness ) and audio / dialogue. Eventually, I didn't. Looking back on it, I should just have done it. Even if it ended up being a two minute short.
Woah that film would have been cool, I look forward to your game :)