I think it's a bad idea to make the archers able of staying behind the others. Otherwise, ten archers behind one spearman would kill everything with no damn tactics.
It's actually better than warlords. I rellay like the graphics, they are nice and there's no lag on my little e-book. The design of the characters are great, the upgrades are good... When is the following coming ? :D
Why is there no infantry units effective against axes and swords at the beginning ? Seriously, it would be great to unlock the ennemy units as ktherock7 said.