umm? boomerang??? oo k then, anyways..
dude it looks great but as am more of a gamedesigner, let me say the flaws i see:

-the range seems to short, wayy to short, i know its an exe but for gameplay's sake...

-it seems you use c_trace from the center of the screen to determine the attack.. it works... but, this is an axe, the crosshairs shouldn't have to be on the zombie to make an hit, well, am sure you're aware of these...

-oh and the swing seems slow... needs more power, maybe start the animation then increase the speed to give the impression of a power and faster swing, also...

-the player's hands look zombiefied in itself... lol, this is the least.... other than that good job, hope the crits help...