I'm so bad at this kind of game, sorry. I've managed to get my ingredients stolen by the hungry zombies, though >.<
Cool concept indeed! I would highly encourage a introduction/tutorial before actually getting into the zombies level. The art is nice, and the music just feels like it was a perfect fit.
Figuring how it works can already cost you two or even all three of the lives, also, while it has a HTML version and you can see the "how to play" below it, it's always good practice to include some sort of instructions in-game, specially for games with a time-constraint, to prevent the player from stressing while figuring things out.
I hope this helps, cheers! :D