Not bad!
Upon opening this game up, I was instantly hit with the impression that it was just another generic defense-type game, but after some brief keyboard exploration I was surprised to see that you can actually DO STUFF.
The armoured vehicle handles pretty nicely and the sound the machine gun makes is strangely satisfying, but the inability to kill enemies by running them down was a but bewildering. I understand it may take the challenge down a few notches, but I can't help but feel like I've been cheated when I run a soldier down at full speed without any visual feedback whatsoever.
The level design wasn't exactly what I'd call intuitive; in the sense that if you added more obstacles, destructible environmental elements or even based the maps around objectives/missions as opposed to foam-at-the-mouth mouse-mashing it would probably uphold a bit more longevity/replay value. The engine is nice, but I just can't shake the feeling that it's not being used to its full potential.
Overall, a pretty decent defence game. It doesn't bring anything new to the table, but it exceeded my expectations.