WRATH: Aeon of Ruin is a dark fantasy-horror FPS powered by the original Quake engine from publishers 3D Realms and 1C Entertainment and developer KillPixel Games.
The full release across all platforms (Windows currently supported in Early Access) has been delayed until "Summer 2021", this is due to COVID-19 as some of their team sadly caught it and needed recovery time. Even so, they've managed to push out a third content update.
“While delays are never ideal, we wanted to release one awesome final update before going heads down to knock this out of the park,” said Frederik Schreiber, Vice President of 3D Realms and Producer on WRATH. “Summer may seem far away, but we are working diligently to make WRATH the best game it can be.”
The good news is that direct Linux support is still planned, with 1C Publishing mentioning to us today that "The Linux version is planned for the full launch of the game in Summer.".
Until then you can either try with the Steam Play Proton compatibility layer, or perhaps even better is using the open source wrath-darkplaces game engine! The latter of which our contributor Samsai previewed in a previous article and it's looking really good.