Tangledeep is a roguelike for players of all different skill-levels. It has some sweet art, engaging gameplay and the way they've done the character class system is quite interesting too.
Oxygen Not Included, the excellent colony building sim from Klei has another update out. This time, they're more focused on gameplay improvements than new shiny features.
Vector 36 isn't like a lot of other racing games. Instead of a car, you're racing inside a vehicle which hovers above the surface and it's quite interesting.
Jupiter Hell is a roguelike I'm following with great excitement, it's serving a the spiritual successor to DRL (previously DoomRL, now called DRL since ZeniMax flexed their legal muscles) and it's looking good.
Good Company, a business management tycoon sim is a recent discovery and it will be coming to Linux. It looks stylish too, so hopefully it will be good.