What is Entity-Transfers ?
About the Sudden death game mode , it sounds a little boring , so I'll give you an idea You could make a level 'destroy' itself from the sides to the center (or the other way if you want) with 'mazes' from each side (probably from 8 or more sides) and have an open 'arena' area in the middle for the last standing to push eachother until one remains But this idea will be hard to implement because it'll require a lot of bandwidth to synchronise on all clients , the other way is 'client' side,but has to be timed exactly the same on all clients...

PS.: Sounds great , btw , something that I'd love to play (Like I played Ballance once )