This game reminds Smoking Simulator, but it doesn't mean that your game is unoriginal. Models are nice, sound design is good. The game adhers to the theme. Moreover, there is potencial for adding new mechanics, like more irritation because of confusing books which were late with ones which were on time. Also it is possible to cause some event in case of confusion, like irritated clients making noise, for example. However, maybe it would be better to make [E] hint for every interactable object, like it was done with working table. In general I enjoyed the gameplay.
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Seems like I forgot to drop a comment, but my first thoughts were exactly the same regarding adding some sort of highlight to all the interactables. Other than that, you pretty much summed up everything else . For OP, an idea for improvement would be a score system and adding more "events" that increase in frequency over time.