1. How long does sign ups last? (Add to post, maybe?)
2. Maybe account for an even number of sign-ups and add a "deathmatch" mechanic in the end when only 2 players remain.
Sign-ups would probably last 4 days. If we're at an even number, then they would be extended until we have 1 more player (or 1 less).
There are other problems with having an even number of players. It's very possible that everyone would die, and there would be no winner at all. This would require bringing people back to life to start the round all over again, and that would just be silly. Furthermore, the deathmatch rules would have to be fairly complicated, because I wouldn't want something silly like rock-paper-scissors. But I wouldn't like to complicate the rules, because I really like the simplicity in this game. The entire rules can be read through in 30 seconds, and I want to keep it that way.