I don't know what to think about this game. Looks pretty good, but I find that the strategy is almost absent, you just keep attaccking again and again until you gain all the upgrades.
For me, there are too few upgrades.
I don't get why the charge is a choose: if it bring a lot of bonuses with no drawback, why don't simple always charging?
The bigger problem is that you run in the same way with the same enemies, so you do almost the same tactical decisions every battle.
I didn't like also the fact that you can have only a ploton of each unit: how about give a limited number of slots where you can put what you want? This will add a lot of strategy and personalization.
This, and a levels-based gameplay istead of only a road, imho will make this game a big 5 stars.