It's truly a grate game!
Some more suggestions and tips :)
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Strengthen the world's believability: Add small, optional interactions (such as daily routines or minor events between scenes) to bring more "life" to the world and its inhabitants.
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Deeper character development for Elena: Introduce more internal monologues where Elena struggles with her emotions (hope, despair, adaptation, resistance). Allow players to make some choices in direction, which would create a stronger emotional bond with her as they follow and influence her inner journey.
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Variation in interactions and scenes: Use different types of challenges or "mini-games" to vary the pacing. For example: sneaking away, gaining favor with certain characters, mental endurance tests, pushing her limits, or training her own holes.
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Greater impact of player choices: Even small decisions (how she responds to someone, which places she chooses to visit) could influence minor scenes or how NPCs treat her. This gives the player a sense of control even within an otherwise powerless story, paradoxically enhancing the feeling of entrapment and desperation.
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Sound-based enhancement of atmosphere: Experiment with subtle soundscapes (such as distant slave labor, screams and moans, chains, and murmuring in the background of the city) and more varied lighting in the environments.
Ether way it's all ready a good game, and brings your audience mush joy. All the best /