It worked, I won the contest. See here to read how I did it.

As I said before, the success of any bot depends on the other bots in the room. At the moment, I'm having good results with these bots:


The one on top has these settings:


What it does, is simply wait for the round in which all other bots are too peaceful and don't drown anyone. Then, at the last Move, it drowns all opponents and instantly kicks them out of the game.
These are the results per game:


Why am I sharing this? I like the game! And as much as I like winning, it's more fun with real players. All rodents and insects (example: Bee, Wasp, ...) are Admin bots to keep the game alive. That's why they sometimes use the same strategy.
Long term, the game can only be sustainable with real users. If 3 or more real users join, the Admin bots won't join that round.