Good news Croteam and Serious Sam fans, as 'Serious Sam VR: The Last Hope' [Steam, Official Site] will come to Linux as soon as it's possible to do so.
From the Steam forum post:
QuoteYes, seen that demo. We will be supporting SteamVR on Linux via Vulkan as soon as it becomes available.
Really great news, and awesome to see Croteam be so willing to throw their games at Linux. Games like this make me much more tempted to get a VR headset than all these tech demos we've seen.
About the game
Have you ever wondered what it's really like to be Serious Sam? Have you ever wanted to fight Mental's alien hordes with your own two hands? Well, now you can! Step into the shoes of the Earth Defense Force's greatest hero in this unique VR simulation based on Sam Stone's own log files from his time as captain of the Battlecruiser Saratoga. Experience the missions that turned Captain Stone into the legend that he is today.