It gets pretty boring and repetitive once you unlock hero zombies. Can there just be a conquer all button or something? It gets tedious watching the attack animation knowing there is no way you will lose.
How about if all that's left is the enemy castle we win? It's no fun having to take down a castle with a single troop dealing 2 damage when it has 300+ health.
Waiting for a tower to slowly break apart due to a poorly aimed shot and finally fall over after five or six minutes of me leaning to the right and saying come ooooon is more fun than I thought it would be.
To everyone who is saying only 2 buttons work, the march and retreat buttons are for individual unit groups, for instance if you just want a constant supply of imps to hold back whatever is coming at you while waiting for your titans you can click on the imp button then press march. Same thing if you want just your hero to retreat while your monsters hold off whatever almost killed him.