The food chain of What Did I Do to Deserve This, My Lord?! starts with soil, which when hit with a pickaxe
creates a creature. The simplist and most important creatures are the producers: spirits and slimemoss which distribute the soil's magic or nutrition around. More nutrient soil creates the first consumer omnoms, which eat only slimemoss. Even more densely nutrient soil produces second consumers, lizardmen, which eat the omnoms, and dense magic producers Liliths, which eat the omnoms, and spirits.
The gameplay of What Did I Do to Deserve This, My Lord?! is almost entirely about creating a stable food chain. Slimemoss turn only after hitting a wall, therefore the player can confine slimes into different movement patterns like strait lines or squares. But this can create perhaps too man slimes. Even though omnoms eat slimes if slimes are too densely populated they can eat omnoms, but if the slimes are too few, they die out, or evolve and even overpower the omnoms. The same happens upper on the food chain as too many lizardmen can kill off the omnoms etc.. The player must try to control the food chain so that it maximizes the amount of creatures and especially creatures that are high on the food chain, so that invading heroes can be overwhelmed.