I love the audio and sound effects. It's cute!
This game sort of mirrors my own experience working as a waiter. People did get randomly irritated with various things over which I have no control. We worked in a lodge where these little rodent critters would get into the breakfast buffet, munching on muffins and whatnot.
In all seriousness, there were times when I got fired and I wasn't entirely certain why that happened or what I could have done to prevent it. It would be nice to formulate more of a strategy so I could always please all of the customers.