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This shows that the City is a virtual reality were several dreamers are linkes together while their real bodies are held in stasis. If someone dies in the dream, they die for real. The yellow cat is actually a blonde boy, he excapes and wakes up, but returns in the sequel. The pink cat seems to be working with the evil guys while not wanting to. You can tell because only they have the weapons made of light. The Pink Cat is just part of the AI, that's why she can't return to the real world. She's not real. It seems that at the end, the Boy destroys the whole City, presumably freeing all the dreamers, but the Girl disappears together with the rest of the data. Credit to TheSerpit for pointing this out :)
Cat cats City ending nightmare savior Secret