One problem with this game is how long the animations last. For me there's more time I spend watching animations then making decisions. I think there should be an option for fast animations or skip animations
Sudden Death is too hard because you can't group-up to make one huge attack instead you send mini waves and the enemy attacks your newly conquered but not reinforced by the other cities yet and you lose.
That's a good idea, one I hadn't considered before. I added it to the "Potential features" list. Thanks for the suggestion!