Just found it was released as freeware by the team that made it.
http://skasoftware.com/
WOOT! I played this as shareware a few months ago, and have been agonizing on whether to actually pay for it or not. It defintely wasn't worth the original $20 asking price, but it was definitely worth playing past the end of the shareware version.
SCZ is a 2d isometric zombie game. It's half RPG, half arcade shooter. You get to wander around town, interacting with two opposite factions of survirors (SWAT team members, and rebels. You'll often find them fighting each other, which is a great way to get new weapons and more ammo), and of course millions upon millions of zombies, zombie dogs, ghosts, demons, those evil little girls that seem to be EVERYWHERE in horror stuff these days (Thank you, Ring ), giant zombies, etc. Lots of different weapons, enviroments, important characters, party members to follow you around, money to make, gang leaders to duct tape up and torture with a car battery (>=D), lots of different stuff you can do. Oh, and there's a story about how the zombies came to be and stuff. Really, fun game.