


In some places FPS drops to 18
The game works in Steam Deck with default proton version, i have no crashes or major problems with it. Actually the game gets 30 FPS at the most, (with all graphic options in LOW settings, FSR 3 activated and Balanced mode) but it can fluctuate quickly. In some open areas, you can change to 'Quality' mode and upgrade textures and illumination to medium settings and FPS will be around 29-24 but when you enter the base, FPS will drop very fast with whatever mode you have on (usually drops to 20-14 FPS). Here you need to adjust all parameters with the lowest setting possible, and set quality in 'balanced' or less.
So, for me, the game is playable but if you consider 30 fps at the most (and many times drops to 28-26) unplayable, you won't enjoy the experience.

No bugs that can be blamed on proton anyway :D
works great!
Runs flawless at 60 FPS in 4K with Radeon RX 9070 OC (not XT version)

LD_PRELOAD="" gamescope -H 1440 -W 2560 -r 120 -f --force-grab-cursor --hdr-enabled -- %command%
With default graphic settings, very noisy and blurry. Disable Motion Blur, FSR and Frame-Generation for a much clearer image and more details.
Game is completely unoptimized (no Linux issue)
Crashed one time in more then 11 hours of gameplay.
Arguments explained: LD_PRELOAD="" => fixes the Gamescope stutter issue; gamescope -H 1440 -W 2560 -r 120 => change this to your monitor resolution and refresh rate; -f => use fullscreen; --force-grab-cursor => forces Gamescope to "hold" the mouse in the Gamescope window (good if you have more than one monitor); --hdr-enabled => Enables HDR Support; -- %command% => default Steam argument to start the game;

Movement/Audio fine, LoD drop off is extreme (medium distance textures are indiscernable), Ghosting around characters, shadow edges jagged
Blurry shadow edges/Frequent screen tearing
Attempted initially to run with Proton Experimental but the game refused to launch, received a "Failed to Find Store" message. Also tested with GE-Proton9-26 with equal results to GE-Proton10-4. Have not attempted any tweaks or tinkering yet.