Sweet.
This was a good game.
Graphics - Hadn't seen many of the things in any other game, and zombies liked to explode. Always a plus.
Style - Zombie Defense game, except from what I've seen it doesn't end. There's also a lot of strategy to use, what with the large variety of weapons to use.
Sound - The constant moaning gets annoying, and the autoshotguns sounded like they should be bolt-action sniper rifles.
Violence - Don't get much more violent than blowing the crap out of thousands of zombies and making them bleed everywhere.
Interactivity - Lots of it.
Overall - Good, but could use a couple of things. In example, the buy screen says "Laser cannons", when there's only one. And a Sniper Rifles category would be pretty sweet. It could have a bolt-action rifle as the lowest level one (slow recharge between shots, slow reload (one bullet at a time gets to be a bitch), highish damage (15?). And the second-level one would be much better, as in it would be a semi-automatic antimaterial sniper rifle, with high damage (50-80), fast reload (clip-fed), and have a low cooldown between shots. Both would have low ammo per clip, as snipers don't carry that much.