I think it would be fairly replayable? It will depend on how many risks your players take, because how bad the haunting gets, and what form it takes, changes depending on their actions. There's also a bunch of different ways for the game to end.
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Sounds cool. I am interested even if it's not that replayable I was just trying to get an idea of whether it's more of a sandbox for running a type of adventure or more of a planned adventure.