Sad news, I was really looking forward to playing The Vanishing of Ethan Carter but it looks like I won't get a chance. The developers have come across too many issues.
They had come across some issues a few days back:
@AngryPenguinPL Still looking, but first attempts were not encouraging, sadly :( (lots of heavy visual errors etc.)— Adrian Chmielarz (@adrianchm) January 23, 2016
And now it's on hold:
QuoteSorry to keep you all waiting for so long. We did some tests with Linux and we experienced a lot of difficulties. Because of that, we put the port on hold for now but may return to it at some point.
Looks like Unreal Engine 4 has ways to go to fix up their Linux support properly.
I hope none of you were silly enough to buy it based on their comments about looking into it before, as you know we have a hard stance here: Don't buy it until it's on Linux and playable.