If you need a new retro boomer shooter check out Ctesiphon

Released in November, Ctesiphon puts you in the role of a Galactic Bounty Hunter extraordinaire in a fresh retro styled futuristic boomer shooter.

Interestingly, this one was built entirely on Linux. The solo developer mentioned they built it over a decade using "C/C++, OpenGL, and open-source Quake mapping tools" with a custom game engine. Some more about the Linux development and support on it:

Made in bits and pieces over the course of nearly a decade by a single developer on Linux using C/C++, OpenGL, and open-source Quake mapping tools, Ctesiphon's custom engine allows for the game to run reliably on low-spec systems. It's built to withstand large firefights with dozens of enemies, hundreds of blood spatter and bullet impact decals, and piles of giblets and scrap as you blow the enemies apart into clouds of particles and debris.

Ctesiphon has been developed on Linux first and supports virtually all controllers connected to it. On Windows only XInput-compatible controllers are supported natively, but others will work fine with SteamInput enabled. The big exception is for the Steam Deck and Steam Controllers, these won't be natively supported on Linux/SteamOS until after release but in the meantime they should work fine if you play the Windows build by setting compatibility to any version of Proton.

It's also Steam Deck Verified, although it uses Proton by default on Steam Deck due to controller issues with the Native Version that the developer mentioned some info about it in a previous Steam announcement.

Have a look at a previous trailer for the game below:

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