As far as the loading message, I do not see that as much of a problem, but will probably remedy it later. Chat history, on the other hand, would be impossible; as every bit of UserInfo storage is used already. No place for history! Oh, and killing a link: select the user whose link you wish to kill and click on the 'Clear' button.

The world constuctor that starts with 'super' should have a 'prepare();' call in it. With that, this should run online. But, you could also include the enemy (Alligator) in the 'prepare' method.