Here is an overview of the game, via its teaser website:
From Cyan, the indie studio that brought you Myst and Obduction, comes a new steampunk adventure.
The game of Firmament is a resplendent, magical, journey — a monumental voyage through four diverse and curious realms, working in concert with an ever-present, clockwork companion, and the support and instruction of a long-dead, ethereal mentor.
Everything is not as it seems.
According to the YouTube description of the teaser trailer, Firmament is “a new VR experience.”
Watch the teaser trailer below. View the first screenshots at the gallery.