

The game is completely playable. I finished it together with bonus material and didn't noticed any issue

Locked to 60fps/60hz, using Medium settings. Also playing at slightly lower resolution with FSR to native (2 sharpness). Has 16:10 support.
Only played an hour or so on Deck, this game is better on the big screen with headphones. When I tried it out in the past, it would crash randomly, but I didn't run into that this time.

TDP limited to 10w
Zero issues, no stability problems, I played it start to finish on an OLED. 10W TDP, holds 60FPS no problem.

Amazing game that works straight out of the box. 60FPS with good quality visuals, easy to read text, minimal issues overall
Very rare crackle coming out of sleep (only happened twice)
2 crashes in a single 12h playthrough.
A great game, I only had 1-2 hard crashes and tiny audio issues in my entire playthrough.
You can get this running at native resolution (1280x800) with custom graphic settings inside. Here is what I used
- antialiasing: 4x
- FXAA quality: high
- anisotropic filtering: 4x
- Shadow quality: medium
- SSAO quality: low
- background quality: high
- godray quality: off
- volumetric light quality: low
- draw distance: 15/20
- lod distance: 14/20
- grass distance: 10/20
I had easily 60FPS locked so you can even boost these if you want to play around.

40Hz
Maxed out settings with 40 FPS cap

Cap to 40hz to improve battery life a bit
Battery life is not great, but the game works perfect

d3dcompiler_47 installed otherwise it wouldn't launch the game
Cloud save from epic didn't detect. Had to reset the save path and let it reassign it then allowed to download the save.
5-10 crashes throughout the main story playthrough. Never at the same places, crashes seemed random

Used DaniMayCry's settings on the "Waking up to a Nightmare" level.

You can get a pretty stable 60fps with some dips with these settings:
- Resolution: 1280 x 800
- Fullscreen: Windowed
- Vsync: Off
- HUD: Enabled
- Antialiasing: 4x
- FXAA Quality: High
- Antisotropic Filtering: 8x
- Shadow Quality: High
- SSAO Quality: High
- Backdrop Quality: High
- Godray Quality: High
- Volumetric Light Quality: High
- Draw Distance: Max
- LOD Distance: Max
- Grass Distance: Max

Proton Experimental
I have the game from the epic game store, so I installed it using the Heroic Games launcher... I had the "g_mlocaltoclip" problem, that I could solve using installing DXSETUP.exe and vcredist_x64.exe, as explained in the link provided... After that, the game works perfectly and it is a real pleasure playing it on the steam deck...
Medium, 30 fps, 8w

The deck handles ultra settings with 60 fps and almost no dips! Light in the game may seem blocky but that's how it was originally made, that's not an artefact. With 30 fps it's barely noticeable.

40fps / 40 hz + TDP 10
The Steam Deck can run the game at max graphics, but you will get a fluctuating fps between 48-60 depending on whats happening. Lock it to 40 fps / 40hz for stable fps + better battery life, and TDP = 10.
with max graphics and the fps cap, you are looking at around 3hs battery.

Made the back grip "run" which made it easier to dodge attacks while keeping your thumbs on the sticks.
Changed refresh rate to 40 Hz and the frame rate to 40 fps in the steam deck menu. The game runs very smoothly and you get more battery life.
Great game on the Steam Deck

40 Fps Limit
Works flawlessly. Played all the way through without a hitch.

As some other mentioned if the game does not start you should install steam common redistributables from the store.
Dropped fps to 40 for better battery life
The default settings are set to medium. However changing settings to high and turning off Ray tracing makes the game look even crispier without any hit on performance. I chose to play it on 40fps for better battery life and less heat stress but can run at 60 perfectly fine with high
Even though the game runs fine out of the box, I changed the video settings so that the game would look as good as possible without hurting the FPS. The settings I used are as follows:
- Resolution: 1280x800
- Vsync: On
- Antialiasing: 4x
- FXAA Quality: High
- Anisotropic Filtering: 8x
- Shadow Quality: Low
- SSAO Quality: High
- Backdrop Quality: High
- Godray Quality: High
- Volumetric Light Quality: High
- Draw Distance: Highest
- LOD Distance: Highest
- Grass Distance: Medium (half the progress bar)
With these, the game stays around 60 FPS, and in some areas it drops to ~50 (but it happens rarely). Bumping up the Shadow Quality will require you to set the Steam Deck's refresh rate to 50 or even 40 Hz, but even then it may still drop to 30FPS in some rare occasions.
I limited to 40hz to save battery
The audio issues that others sugested aren't there with default settings anymore, so they must have been fixed. All in all great experience, played from beginning to end with no bugs.

Per garantire una buona durata della batteria senza compromettere il gameplay: Limie a 40 FPS Ombreggiatura a velocità dimezzata Filtro di Scala FSR Nitidezza 1
100% playable out of the box with no tweaking. Weird as most reports say to use different proton etc.. but I played from start to finish.
Perfect on Deck
Default proton 6 missing audio in cutscenes. Needs proton experimental to fix
No audio in cutscenes without proton experimental but this caused heavy artifacting around the character in fight scenes
There is only sound at the first cutscene. When playing the game for the first time. 0 sound in gameplay. Had to reboot the game. Then I got sound on the gameplay, but no longer do I have audio on the cutscenes. Why is this? This problem for me is in steamdeck. They better fix it
Sound is garbage, can't be played correctly right now in steamdeck and audio in this game is extremely important
-noblur
As usual, play with the settings for lower power usage, adjust draw distance and detail to medium. You can get 12Watt / 3:45h of gameplay and still keep very good graphics (8xAA, FXAA High, 4x Aniso, Low Shadows, Low Occlusion, High Backdrop, Godays, Vol. Lighting, etc). Potential for even better battery lowering graphics.
Add launch parameter "-noblur" and use Proton Experimental to avoid the big white blocks when shining the flashlight on enemies
Proton-7.0rc6-GE-1
Large grey squares when aiming at enemies, using Proton-7.0rc6-GE-1 fixed this

Runs fine with Proton-7.0rc6-GE-1. On the default Proton 7.0-2 the game shows artefacts when using the flashlight.
On Proton 7.0-2 changing the graphics preset from high to low and back fixes the artefacts temporarily for the level. Proton-7.0rc6-GE-1 fixes it completely.
Grey blocking when shining enemies with flashlight, causing them to be impossible to see.
Half Precision
White squares when aiming
Had issues with white squared apearing when aiming (Default Proton on Steam Deck). Tested Proton GE 7.16 and Proton experimental, they behaved the same.
I managed to run in without problems using Proton-7.0rc6-GE-1
Awful intense gray blocky corrupted graphics covering the screen wheen shining enemies. very distracting
Gray artifacting when beaming enemies
Low settings do not fix this