All Zombies Must Die! has a fun, over-the-top look to it that helps to keep the game on the comedic side of the zombie catastrophe. Not only are the characters a bit too stereotypical or outrageous to be taken seriously, but everything from the dialogue to the zombies themselves make for a very lighthearted game. Where other games would have overly decomposed former-humans slowly creeping themselves to a very gory end when you finally use your various weapons against them, AZMD! tones down the gruesomeness a bit and makes the subject far easier to be accepted by a wider audience.
All Zombies Must Die!'s audio is okay and gets the job done, but neither the music nor the sound effects are going to be all that memorable once you've walked away from the game.