Overall Good, some dislikes
I like the game, so I'll preface with that. Yet there is that continual "however", so here goes.
I would like to be able to hold down space and just push left or right to change the direction I'm shooting in.
I also don't like that zombies will come up directly beneath me and there is no chance to evade them, so I get hurt regardless. Perhaps it would help if the ground showed a short animation of them digging their way out first to give me a warning to move my butt over.
Great fun though. :)