Caves of Qud from Freehold Games is a roguelike with some truly ridiculous depth to it and after many years of development they're going to be upping the price on April 18th.
Artifex Mundi just recently announced their new satirical point and click adventure game, Irony Curtain: From Matryoshka with Love, will be releasing in Q2 this year with Linux support.
Eleventh Hour Games have announced that their impressive action-RPG 'Last Epoch' is getting a big update with the Beta release on April 30th, a Steam release will also happen then too.
Remember The Ultimate Nerd Game (TUNG)? Well, it's now called Logic World and it's getting a massively expanded release this Summer with full Linux support.
Littlewood from developer Sean Young was a huge success on Kickstarter recently, with regular updates progress does seem good but it's going to see a short delay.
War Brokers is a pretty good online FPS that has a number of different game modes like Battle Royale, Team Deathmatch and more. It also has vehicles and a lot of other surprising features.
How about something a little different? Your Future Self is a somewhat short at 1-2 hours story-driven experimental text adventure and it's now supported on Linux.
I've had the pleasure of testing out the platformer DASH: Danger Action Speed Heroes for a while now and it's truly shaping up to be an impressive game.
One funding campaign I completely missed was Crossroads Inn, a fantasy tavern simulator that managed to get fully funded. It looks pretty good and it's coming to Linux.
The bullet hell dungeon crawler Enter the Gungeon just recently had a huge update, the last major update it will be getting as developer Dodge Roll moves onto other games.