Super Jagua is a retro platformer inspired by Super Mario Bros. The game recently came to Linux and the developer provided us some keys to throw at you.
Planet Explorers, the open world sandbox adventure RPG has finally left Early Access. The developer accepted my request for a key so I could take a look.
BallisticNG is an in-development racer heavily inspired by Wipeout on Steam. It seems it has picked up a community member to bring it over to Linux and has unstable builds available.
SEUM: Speedrunners from Hell, the rather good speed running game has been updated for you to make your own levels and you can download them from the Steam Workshop now too.
Orwell, a game about investigating citizens to find out who is responsible for terror attacks is coming to Linux. The developers are looking for Linux testers.
The developers of Helium Rain sent word that their realistic space simulation game will fully support Linux at launch. The main developer is also using Linux to make the game.