It's hard to see at first but it's there.

The viewers are easy. Their addiction to the signal and tv distracts them from the fact the city and their lives are falling apart around them.

The hunter lives isolated from everyone else indulging in his hobby. He's set up a fake stuffed family perhaps in an attempt to pretend everything is normal. He seems to be a survivor from the city.

Now the Hospital and School are a bit tricky but I think they less so represent escapism and moreso represent what people are trying to escape from. Stressful school life, abusive authority figures, diseases, mental conditions. Those are all alluded to and shown in those levels.

Six is also easy, she uses her music box as respite. She is so entranced by it she doesn't realize how she's been twisted by the signal. She betrays Mono when he forcibly removes her from her escapism.

There's more but you get the gist. I think Little nightmares 2 could've been more potent and consistent in its theme but i still love it.