Quite good.
The game is using an existing commercial franchise. I have no idea if you got right to use it, and I don't care. For me that's very unoriginal.
Music of course is good, not nessesary created by you aswell. The graphics are well made, and the gameplay is umm... barable.
The animations are good, and attacking is fluid, but it gets quite boring, tapping j key all the time, and finishing the zombies away with special attacks from time to time. And I mean it gets pretty boring, in pretty short time. There's no real story whatsoever, and interaction is limited to kicking the enemies' ass.
In short it looks good, but it's not a game I would like to play to kill my time.