HEVN was pointed out by GOL follower micha and after taking a look I was impressed, so I spoke to the developer about their Linux plans for this first-person sci-fi adventure game.
Construct 3 is a game engine that requires little to no programming knowledge as it relies on stringing events together from objects. It's clever and it works really well.
I finally set aside some time to play the supernatural thriller Oxenfree and it's surprisingly good. It's a narrative-driven game, so each choice you make changes the conversations and the flow of the game.
RUNNING WITH RIFLES is the rather excellent top-down shooter with RPG elements that has Linux support. A major patch was just released along with a big DLC announcement.
I've been using a lot of SC Controller to play games with my Steam Controller outside of Steam, but it did have a major issue. I reported the issue and it has now been solved.
As expected, Planescape: Torment: Enhanced Edition has now been officially announced with a trailer and it looks like it will launch with Linux support.
Sumoman is a brand new and rather hilarious puzzle platformer powered by the UNIGINE engine. It released with day-1 Linux support and I took a look. There's also a video of my failures included.
Hollow Knight, an incredibly stylish action and adventure game recently launched for Windows, but it seems Linux gamers won't be left waiting for too long.
This is an interesting one, Snoost, a new cloud gaming service powered by Amazon AWS supports Linux. It uses Steam's in-home streaming with your own games library.
The really fun FPS Ballistic Overkill has now officially left Early Access with a patch. The developers have stated they intend to continue adding to it and have major features in development.
As a big fan of the older Halo games myself, Installation 01 sounds like it could be pretty interesting. It also plans full Linux support due to using the Unity game engine.
88 Heroes is an action platformer from developer Bitmap Bureau that's actually surprisingly great. The hook is that each hero has a totally different attack.