Exalted Seracthon is the first PC game produced by Ravenheim Labs. The game engine was developed between Feb 2017 and Feb 2020, and it has been tailored for the story it was intended for. It was first planned to launch as early access game, with the rest of the content added as it was produced, however this has changed. The game will be complete before launch, and any further content will follow as either a DLC or a sequel.
The sequel (and there very likely will be at least one) may have a coop or multiplayer option, depending on player feedback.