Suggestion
It would be really cool to have a castle versus castle option.
Another thing that would be cool is Evil vs Evil.
One more recommendation would be that if the heroes level is higher in Versus that the trees health gets higher too. I cant count how many times Ive fought a level 40+ assassin in multiplayer who just ran up and instantly killed my tree. Rangers can also kill the tree from behind the castle gate, so Id recommend the tree become invincible to only enemy heroes attacks until after they leave the gate.
Biggest things that would be cool though is Good vs Good and Evil vs Evil
Calcoher about
Heroes and Castles Premium