Yay, kill zombies.
Well, this is a competent game for killing zombies, their heads blow up good and all so I can't dislike it. I played it long enough... It takes a while for the fun to start though, way after I'm finished upgrading things. But then it comes to a matter of repairs.
But, the main trouble for me, is I got around 2200+ kills, and asked for the next wave, and there... was no zombies coming out, I waited and waited and nothing was happening. :( Foremost you should fix that. Or did I win the game?
Having a goal would be nice, like survive X nights. Anyway good luck on the future.