Just an update and I have to admit, this game is quite addictive when you get into it. I'm level 21 already. I was going down the melee route of charging in with axes and chainsaws, but have since decided to go for rifles. The game is very repetitive but still fun at times. The way the leveling system basically forces you to go further into the city to find loot and supplies that will be useful to you (as lower level meds and foods no longer work) is a pretty cool mechanic. You require more money for the basic things - especially food and ammo, so you need to go into the really dodgy areas where the zombies are red and dangerous and run like Carl Lewis on steroids.

When the game is finished and the player run Outposts are implementing, this will be a fun game/diversion, especially if it stays free.