Edge Of Eternity [Official Site] is an upcoming RPG that looks quite amazing, however, they're still waiting on Unity supporting stuff they need before having a Linux version.
To jog your memory, it was funded on Kickstarter way back in 2015 with $161,246 pledged from 4,045 backers. Linux was not a stretch goal and they even had a demo for us as well.
However, back in December of 2016 they claimed they were waiting on Vulkan support in Unity before getting an alpha out of the Linux version. After speaking to them on their Steam forum recently they said they are in fact still working on the Linux version, although it seems they're going with OpenGL now and they gave a list of what they need from Unity3D here. They also said in that post, that they actually dropped some plugins that were blocking them from bringing it to Linux, so that's nice to know.
You can also see an older trailer of it on their YouTube, as they don't seem to have any up to date gameplay videos on it. They will be at Gamescom next month, so we should see fresh gameplay from that. Some shots they gave out at the end of last year looked quite nice though:
Hopefully they will manage to get the Linux version out, it sounds like it's still a while away from releasing.