Well, here comes the feedback!
Very cool explanation in the begining, but I can't go back.
I loved the pixel art. Unique art!
I discovered that I can kill my self.
Doesn't have a main menu, very sad ;(.
In my opinion the map could be bigger, and the aim is too big (maybe make an default aim), the rest, is awesome, could have more waves like zombies, I liked that when you shoot the bullet can transform into a enemy. I saw this in a friend's game last year.
Keep up with the good work Vortex!!!