Of course it is :) Great! Here are some more thoughts and ideas, specifically for Chapter 2:
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"People's Hidden Districts": Let Elena access forbidden parts of the city through secret paths or by bribing/corrupting guards.
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"Public Displays": Use the city to create new types of scenes (public punishments, slave markets, etc.) where Elena can be exposed and earn money through humiliation, or witness the treatment of others.
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"Faction Influences": Perhaps there are different factions or groups within Unian society that treat slaves differently — create small choices around which "owner" Elena might try to attract the interest of.