By the time Lost Ember begins, humans have vanished. Something, or someone, mucked things up so completely that nothing but their sturdiest architecture survived. You play as a wolf exploring the ruins of humanity in a bid to understand the why and wherefore of it all. Accomplishing this means inhabiting the bodies of other creatures to uncover parts of the world beyond where your paws can tread.
The menagerie at hand could have you plummeting over waterfalls as a fish one moment and then hopping into a turtle so you can dig up root vegetables. Neither might help you solve an existential mystery, but it looks mighty interesting.