Well intentioned but extremely difficult to use, Tyto Ecology is an ecology simulation game where you become a master of the environment as you work to create a functioning ecosystem.

You fly around, dropping creatures as you try to balance the producers, consumers, and decomposers. Content includes 30 animals and plants, plus more that can be unlocked as in-app purchases. The app is free to download and play. Expansions are available for $1.99 each to add new biomes.