There need to be more advanced commands for troops, like prioritizing certain mobs so that the rest aren't completely excluded. It's pretty inconvenient to have to completely dedicate a troop to armoured when there are only a couple armoured mobs giving you the trouble. Leaves you hanging for the rest of the level...
So I've managed to beat all difficulties, except for apocalyptic, by spamming the cheapest unit until I can level up, then buying a bunch of Kalashnikov soldiers once I get to Osama age. Doesn't work for apocalyptic mode though. Seems impossible...
It also seems that you get more karma from dying than killing, including if your tower is getting hit, so I guess the strategy in early game is to figure out how to maximize losses and minimize kills... very messed up game.
Hmm, interesting. I upgraded my leader's damage at the beginning of the game, but he doesn't actually do more damage...he always does 12 damage. I then tested all the other upgrades. Range upgrade doesn't do anything. If you look at the backwall there are lines. If you count from your tower, your tower always starts shooting before the sixth line, even when fully upgraded. As for the speed upgrade, I didn't notice any difference, and if there is it is very negligible. The only upgrade that actually seems to work is the meteor upgrade, which at level 2 lasts about a second more, and at level 3 lasts about 3 seconds more. So basically you're wasting your money if you upgrade your leader defense. Is this game unfinished or what?