Take command of your mercenary forces in Atom Zombie Smasher. The zombie apocalypse is upon us and it's up to you to evacuate everyone before they fall prey to the undead. Conduct massive rescue operations with a helping hand from snipers, artillery crews, orbital bombardments, and more. Experience the tactical richness of fully-destructible environments and procedurally-generated campaigns. And when the apocalypse ends, create your own game mods and share them with the Online File Share.
This is one of my favorite games ever.
I absolutely love the music and art style. The gameplay is quite addictive. The game has not gotten dull or repetative at all.
The fact that it also has local co-op and mod support are just icing on the cake.
There are only a few things I think the game could benefit significantly from: the music selection could be a little larger, music, a level editor would be nice and a way to play in cities that are larger or smaller than the standard city (though the latter two points may already be possible through mods).