It's a nice game, gets repetitive and monotonous quite fast trough. Could use a bigger map and more different types of zombies for more diversity.
The gory graphics on fullscreen make this a good visual zombie shooting experience, only the similarity of zombies somewhat reduces that effect.
I find that if you play at least somewhat carefully and are good with timing on ammo and powerup pickups it is nearly impossible to lose. After getting the last medal - I wished the Zombies would get me sooner. But if I made right decisions - I just couldn't lose. I started to do some impractical and impractical stuff for the game actually to end.
There is a but that if you turn music to zero - you cannot get it back working again.