a pretty fun and nice game, though the difficulty climb might be a little too steep for my taste. maybe you should make a slightly less steep difficulty climb?
also, there was a feeling that i couldn't use the weapons that i wanted to use. i wanted to use the SMG and assault rifle classes, but i was forced to repeatedly return to the shotgun because there were so many vehicles, and i typically died as soon as i ran out of shotgun ammo.
finally, while the damage bars where interesting, it was tough to estimate how much stronger one weapon was when compared to another. some weapons that are, in gact, superior to the one your using looking like they deal almost the exact same amount of damage, and you have to carefully compare the damage output bars to see the couple of millimeters that make up the difference. numbers would be better as they are easy to compare and contrast.
however, i did like the AI that fought along side you. with most AIs in games, you see them focus on enemies based on proximity, ignoring stronger bosses and the like. with this game, though, the AI focuses it's fire on the strongest enemy on the field.
overall, though, a fun game to pass the time with.