Here's a title that may appeal to a specific audience. Namco has released Tamagotchi: 'Round the World in both full $5.99 [App Store] and free Lite [App Store] versions.
Interact with cute clouds, playful plants and gleeful geysers to raise the ultimate pet: An entire planet! Keep your Tamagotchi well-fed with fresh fruit and tickle them until they fall down laughing! Play with the environmental creatures called Gaiatchi and earn Stars to buy Tamagotchi stamps for your virtual stampbook! Eat, dance, play and even poop your way to a happier and healthier planet!
The game is an updated version of the virtual pet phenomenon that was/is Tamagotchi.