As I was starting the game I was wondering, if there could be done anything to make "... Shooter" games from Sigma Team even better than they are. When I saw character select screen I was confused - "it looks same like in Alien Shooter... maybe they just replaced aliens with zombies?". How mistaken I was.
So what could be done to make this simply yet amazing game better? Upgrade and level up system! I didn't liked how Alien Shooter forces me to use next weapons because if I won't, then I will not make any progress and won't complete game. In Zombie Shooter you can upgrade your favorite weapons and use them for much longer time - now you don't need to buy this uber plasma minigun to beat the game. And what's the deal with leveling your character? It makes you spent points to skills which make your character fit your style. Also, if you are looking in every corner it has become more rewarding than ever: not only because of money, but also for hidden exp capsules.
You can also see that each level is designed much better than in Alien Shooter. And of course, zombies are also more fun to kill than alien*. The only thing that stays same is fun in killing those creatures - which means great fun.
I'm glad that I buyed and tried Zombie Shooter. Maybe it's because I'm fan of Alien Shooter but I had fun, and probably I will have more when next time I will have whim to play something not demanding, brainless and with tons of blood. I wanted to kill zombies and Zombie Shooter delivered it. Good job Sigma Team.