Jump Space (formerly Jump Ship) actually looks incredible if you're in the market for a new co-op game and it arrives September 19th. It already works well on Linux / SteamOS and Steam Deck from previous demos, and the developers said they will be working on improving Steam Deck performance with Proton.
Check out their two brand new videos:

Direct Link

Direct Link
More about it:
Features
Jump across the universe - Select from a variety of hand crafted missions with random elements. No two runs will be exactly the same.
Seamlessly go on and off ship - Once you’ve jumped with your ship, you can switch seamlessly between operating your ship, space walking and on-foot planetary exploration, it just works.
Upgrade, maintain, repair - Manage your ship as you scavenge for parts to upgrade or repair it, and adapt it to fit your needs.
Fly with a crew, or go solo - Jump Space is best enjoyed with friends, but solo adventurers are welcome too.
Manage Your Jump Ship
Upgrade and customise your ship as you face off against the challenges of space exploration, and scavenge resources to ensure your survival. Reinforce your defences, adjust your energy output for speed or bolster your ship’s attack capabilities - the choice is yours.
Immerse Yourself in Space
Experience fluid gameplay as you switch from steering your ship out of an asteroid field to jetpacking towards an enemy vessel to sabotage its core. Seamlessly transition between exploration, combat and traversal.
Improvise and Adapt; Together
Go on missions with your friends and take on roles, from piloting to engineering and field exploration. Work together to overcome enemy attacks, extinguish fires on the command deck or adjust your ship’s power grid on the fly. There are no set classes in Jump Space, improvise and decide how you want to engage.
And now onto the bit that annoys me. Scroll down on Steam to see an AI notice:
The developers describe how their game uses AI Generated Content like this:
Pre-generated voice cloning/Text-To-Speech where it makes sense creatively.
Placeholders will be replaced by real voice acting as development continues.
At least in this case, they do plan to put in real voice acting later.