You're acting as a supernatural deity who is unhappy with the rituals your cult is performing. What they do is basically not a bad idea, but the outcome is not what you would want. There you sit, in your astral realm, crying out "You're doing it wrong!", but they cannot hear you. So all you can do is manipulating their actions. To be more specific: their choices of utensils. Exchange whatever rotten surface, rigged slurpable or repurposed shell they use for their procedure and see what the result will be. But don't experiment too much! If your cult does not have the feeling to succeed, they will leave and worship some other divine power of holy- or unholyness.
One hand tied behind my back
Tools and Technologies:
Unity (any product)
-Pixelart created using GraphicsGale Free -Sounds modified with Audacity
Unzip the file and start the game :-)