Hey, not bad! I would appreciate some things like static items sitting around just for aesthetic purposes, or maybe a way to level up or a ammo system, and maybe the zombies get stronger and faster as time passes! TIME FOR GAME REVIEW MODE! You will be rated on 5 categories, game-play, uniqueness, fun, graphics, and, Functionality. I will explain my reasoning on what I vote.
Gameplay: 4.5/5 Hey, the gameplay could be a LITTLE better, but as far as a beginning developer goes, not bad at all!
Uniqueness: 3/5 I have seen games similar to this, but you could add a few tweaks to bump it up to a 5 star!
Fun: 4.9/5 This game keeps me playing for a while! after some time passes, it just gets old, but, still, not bad!
Graphics: 5/5 as a beginner, I dont expect the graphics to be realistic, but hey, not bad at all! The black gradient at the edge of the arena is quite nice! I like how not all zombies look the same!
Functionality: 5.5/5 I have experienced no bugs or glitches whatsoever! It might have just been luck, or you did a crap ton of bug fixing! overall you got,
22.9/25. Thats the highest score ive ever given! Good job man!