I Hate Running Backwards, originally called Serious Sam: I Hate Running Backwards is an absolutely mental never-ending shoot 'em up and it's now on Linux.
RocketWerkz, the studio founded by Dean "Rocket" Hall will seriously consider a Linux version of their detailed space station construction and management game Stationeers if it gets more sales.
The Linux version of this pretty “RogueVania” has now been pushed out of beta and made available to everyone. A few other things have been added to the game in the accompanying patch.
The strategy game Sudden Strike 4 got some new content a little while ago which allows players to fight parts of the Winter War and the Continuation War as either side. A few other changes were made to the base game with an accompanying patch.
Monster Prom is a game I honestly completely ignored when it released. I will hold my hands up to that and tell you how much of an idiot I was for doing so.
For those who've been wanting to play Black Mesa, the fan-made recreation of Half-Life you're in luck as Crowbar Collective put up a Beta for Linux users.