This is Europa, a "a stylised exploration adventure game". It's the creation of Helder Pinto, a senior environment artist at Blizzard.
It tells the story of "the last sentient droid, a millennia after singularity ran amok."
There's not much to it other than that teaser, but I thought it was so pretty - with such a strong "Studio Ghibli in motion" vibe - it was worth sharing.
You can follow Europa's development here.