Repetitive
I find that as the best word to describe this game. Almost throughout the whole thing, nothing changes. Plus, I would never count this as an addicting game, so I wonder at all the great reviews. I'd say it has a few good points, such as the increase in money, but if you just spent an hour fighting those horrid mountain trolls, 78 gold doesn't really make up for it.
Because of the fact that your monetary income is the tiniest trickle, you'd be lucky if you got maybe one or two good new units while trying to upgrade enough to beat the next round. After a while, this makes most of the rounds just blend into a mush of kill-die-kill-die-blah, blah, blah, blah, blah. For hours.
I admit, it is cool when you beat an army, it gives you a feeling of ecstasy, however, this ends quickly when you see you didn't get enough money for ANYTHING and you see that it only gets way harder from there. After a while, it gets rather senseless and boring.
I will not be surprised if this review doesn't see the light of another day after it's posted, since it's a 2 in a wave of 10's. But, I just wanted to show what I thought of it and to share my experience.