
native has a hard crash on 4th mission, switching to proton build allowed me to dodge it.
Works perfectly fine

The on-screen keyboard can't be used to enter a name for the save game. You can start without entering a name, but this may cause the game to lock up on future launches (see below). It is recommended to bind keyboard keys directly to the Deck's inputs and enter a name that way.
I encounterd one hard lock at the title screen and one soft lock before the opening logos, which happened consecutively. Uninstalling and re-installing seemed to fix it.
With the Deck's FPS cap set to 60, there were long instances of unstable frame times. Setting the FPS cap to 30 fixed it.
Recommend setting the joystick response curves to "aggressive" in the control layout to get snappier camera and movement input.
When the game is launched through the default runtime, there is no audio. Using any of the compatibility options (Linux Runtime / Soldier / Sniper) fixes the problem.
Can be fixed by using any Linux runtime in the compatibility dropdown
Locked FPS to 30. The game is locked to 30 FPS anyway.
You need to give your save game a name, but the onscreen keyboard did not work. I changed the controlls to Keyboard and Mouse and gave the savegame some gibberish name with the available keys.
Naming the save game did not work
Played through the game and its DLC from start to finish without issues. Sleep mode works.