A great zombie title from Blendo Games. I was instantly addicted to the tower-defense-esque gameplay. At the root of the game you will be placing a evaction zone in each randomly generate area as well as barricades, ground troops, snipers, mortars, mines, etc... Then the game plays out as your helicopter flies in sounds it's fog horn, attracting all of the survivors in the area. You are able to move your troops around and such, trying to fend off the horde.
The camera is way above the city. You'll be above the clouds looking down. The helicopter and other larger placeable objects are represented by sprites however the zombies/civilians are represented by just little colored cubes. This isn't a problem, and works really well as you watch the little yellow dots run from the purple dots as chaos ensues.
The sound effects were simple but worked well. They are mostly made up of buildings collapsing and explosions, but they do the trick.
The overmap was fine, but could have been made into more. In the post-game there is a note about the history of the game, pointing out that the earlier game had a more complex overmap, but was cut down in the later versions to focus on the main gameplay. Overall the experience is fun, but it feels like it is missing something.
The "story" is very odd... It throws a bunch of random little comic strips at you, which are range from humorous to just plain confusing. They try to be very different, but I ended up skipping over some of it.
Lastly it is worth mentioning that the game has strong mod support to allow for anything to be changed in the game. I haven't looked into it closely but it was described as being able to change almost anything - I imagine you could change the theme of the game from zombies into something else entirely.
I plan on sinking many more hours into this; you can make your way through a campaign in anywhere from 1-3+ hours depending on your settings - which are fully customizable right in the menu. Addicting!