What first came to mind when reading your querie was The Black Mirror or The Moment of Silence but they are third person games which have a tendency to have a lot of dialogue (not all). Since your husband is hard of hearing would he be turned off or lose interest with all the reading? First person games might be the way to go as quite a few (not all) are geared more to exploration and discovery than dialogue.
I will give it more thought for a first person game. Good luck in your quest as we all have THAT game that turned us into adventure lovers.
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