All in all, a good beginning to a game. It has its positives and negatives, like any game. I will try my best to only leave constuctive critisim here. Firstly, I like the Power ups, great addition to any zombie survival game, they keep it enjoyable. I also like the increasing number of zombies per round.

However i also have some feedback, work on the player turning, its too fast! Or change it so you use the mouse to change the direction the player moves, if possible. And maybe click to shoot. With these features i think the game will be more enjoyable. But apart from those as i said this is a good game and keep it up!

@A11nutty thank you for the comments, i really appreciate your thoughts, i shall crack on with making the game mouse dependant and see how things turn out ;)