I wouldn't mind a crafting system, perhaps with a coop raid setup. For the raids, someone can start it and others join, and you play against the raid boss and it tracks how much damage you do in the match. What do people think about that? could also do coop raids, like kings and legends
How about a way to save different armies to select? If I'm attacking canada, I don't want to have to click down my atk zombies, and slowly add def ones.
I do wish that raids drop items like they do in herenvale. The randomness is nice that way. I don't like how the very best items are available only through chests. That gives some players who spend money a HUGE advantage.