Good game, but...
I found the game to be pretty good, but I did notice that bosses were slightly over-powered and unimaginitive. Every boss I encountered was a giant fat-ass zombie, so it was easy to predict what would come at the end of the level. And their ability to suck your hp up in 2 secs makes them very hard in later levels, but I wouldn't say impossible. Also, i made a mental note that bosses seem to be immune to the AK-47, can you fix that (proof is I shot one with all 200 rounds and its hp didnt even move)?