I made the game menu appear when the game is paused, just in case you forget what's happening. I also added a mute and restart button.
Every sprite except for the tank is done. One more game mechanic I want to add is that the AI can't summon a creature if that creature's totem is destroyed. You can't click your totem once its gone, so why should they?
Last thing is winning the game when the opposite corner's totem is destroy.
If I have the time, I'd like to add in sound effects. Maybe just one sound effect per class (so four) during attacks. I don't even know what kinds of sounds to make, though.