Okay 4#.
Art: 7/10 - Portal on background oh my god, that's a bad idea. (For characthers, their heads look weird)
Music: 9/10 - Nice music.
Gameplay: 8/10 - "Nobody expects the zombies inquisition!" I could apreciate if you add some animation or particles before they spawn so you know where they spawn instead them spawning out of thin air. The cooldown on sword (not the ability but I'll apreciate if you added a gui for that) seems so weird, could be better if you added a swing animation so it looks better instead of a stick that burns everyone that touches it.
Overall: 8/10 - The game needs a rework of background and the spawn for enemies. And needs few animations.