1 and 2 be better...

complicated, but good, I like it.

Visuals too dull and music too generic. Unable to fuel interest.

Good concept, but the area in which to move around is extremely small, making it hard to kite. Especially when the zombies feel like they move as fast or faster than you.

Not bad. I haven't played 1 and 2, so I don't know what they were like, but this felt similar to some other "zombie shooters". I gave you a score of 2.5 because I didn't find anything inherently wrong with the gameplay (kill zombies, survive the night, earn money to upgrade your weapons for bigger swarms of zombies), though I thought it made it too easy when I seemed to be able to die and still respawn back to the same level. Also, if I had some advice, it'd be to find some way to make this game unique in comparison to other zombie type shooters. Hope this was helpful (I haven't reviewed many games -_-; ).