hey, its sounds interesting. I can help you for free but before I jump to Discord, give me a quick 1-sentence breakdown of the main character's core flaw. What kind of narrative tone are you aiming for?
The best thing that I can say right now, is that the main character is the player. The protagonist, wouldn't be silent necessarily, but almost everything that happens in the game will be based on what the player does. Their actions shape the story of what happens in the game. However, I don't intend for the protagonist to not have a voice. However, for the narrative itself, i think a quiet and retrospective feel would be a good place to start for crafting the tone. Not necessarily moody, or grim, but contemplative. Almost as if the player is stopped in time, yet time moves on without them if they stay stuck in their head for too long.
(EDIT): I just realized you are not op but i'll leave this here regardless