"Tie" Goes to Red in Tower Defence? Why?

[_PC_Load_Letter_]

I've played a few games where both sides are equally skilled and the game times out with both sides having 200 castle health. For some reason, every time this happens, the game ends and the server declares "red" the winner. Am I missing something? Seems like in a true "tie" game, either both sides should get the win or neither side.

 

[Qin Shihuangdi]

I think it is determined by who has more gold / Mobs sent / towers but I don't know to be honest.