I am the owner of GamingOnLinux. After discovering Linux back in the days of Mandrake in 2003, I constantly checked on the progress of Linux until Ubuntu appeared on the scene and it helped me to really love it. You can reach me easily by emailing GamingOnLinux directly.
Here's something interesting, the Path of Exile team have put out a news post giving some answers to questions from the community and it has some interesting bits in it for us.
Zap Blastum: Galactic Tactics looks quite unique, a top-down shooter where you hop from one bit of cover to another with simple controls and they claim it's "The cover shooter anyone can play!".
Pillars of Eternity II: Deadfire from Obsidian Entertainment and Versus Evil should now be considered finished, with a brand new patch available to send it off in style.
With a theme inspired by 80s and 90s action movies, as well as comic book series like Preacher and Constantine, The Unholy Society looks like an adventure not to be missed.
Chronicon might not be a familiar name to some, it's not exactly hugely popular but it does have some of the best action-RPG gameplay available on Linux.
Lost in Sky: Violent Seed is one I've been following for a while and it's really looking good now, it's also on track to release soon with Linux support.
A game I gave a little shout-out to recently, the multiplayer action RPG Transformice Adventures is planning to support Linux and it's now live on Kickstarter.
Jumpai is another creative platformer that has you build and play levels created by the community, a little like DASH. However, Jumpai is going to remain free and it has online play.
The Long Dark, a survival game from Hinterland Studio that offers up both a story mode and a sandbox survival mode just got another big update and it's looking good now.