Survival Horror Shooter

The object is quite simple all you have to do is survive versus hordes of zombies while you are taking down a big target moving in the center of the map . You can upgrade your main weapon and change to others.
This is my first game that i develop in early 2015, I decided to upload it now since i want to share with others what i have done. Right now i am developing, using part of this game, another game much more complex implementing a random generator enviroment and a little bit of story too.