Maybe you know [Sleep is Death] is next project of who did [Passage]. And this is not game, well, rather some Tool / TRPG style setting for 2 players only. Not my type, however you could check it. 1.75$ minimum, to cover payment processing fees & download bandwidth.
And... According to GameSetWatch, it was sold to 4,000 people before May & earned 43,000$. Kinda big selling for unusual tool, anyway.