This is really inventive. I see a lot of ways you could expand it or offer alternative modes. Like in Resident Evil games when they have an extra Arcade mode, I could see a full version of this game having an arcade mode with it. Find interesting secrets or survive more dangerous places, get more viewers. Get more viewers/more money, buy better equipment. And maybe the streaming comments could be used too, like maybe before going into a specific haunted house, you could pay an expert, and occasionally, their hints would appear in the comments above.