If I were able to choose one new game in the 'Planet' franchise that would really appeal to me, it would be some sort of nature reserve simulator - call it 'Planet Wilds' or something of that nature.
You could have different options - a fenced reserve where the animals are more contained and so have to be manually brought in, but are safer and also do not conflict with the local people, or an unfenced reserve where animals can move in and out depending on what resources are available for them. There could be all sorts of different challenges involved to running it, such as taking in 'problem' animals causing issues elsewhere, making sure the animals are comfortable enough that they won't stray and cause issues with the neighbours, controlling invasive plants, preventing fires, creating new water sources and monitoring and managing wildlife populations in your area. You can open the reserve to tourists, which will get money that allow you to expand your reserve or better protect it.
A lot of this is inspired by the reserve my local zoo (Colchester Zoo) has down in South Africa. It was first created in 2005 - at the time it was an abandoned cattle farm with barely any wildlife on it. Since then, they have released sixteen species onto the reserve (including giraffe, zebra, ostrich and eight antelope species), and encouraged the natural return of several more including leopard, spotted hyena, honey badger, baboon, Nile crocodile and lots of ground birds such as secretary birds, ground hornbills and both blue and crowned cranes. Their plans for this year are reintroducing the cheetah and the Cape buffalo.
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