Impressive showing on the Steam Deck (OLED), settings below

[Xeawn ~Rafa~]

I've played through the opening sequence including the battle on the sled all the way back to the house and maintained stable 30FPS the entire time with these settings:

Getting the game to launch:

Ensure that you set the following launch option first: SteamDeck=1 %command%

Gamescope Settings:

Refresh rate: 60Hz
Frame limit: None
TDP Limit: 12
GPU Limit: None (you could probably play with this a little for more battery life, I've not yet)

In-game settings:

Frame Rate Limit: 30 fps
Scaling Method: AMD FSR 3.1
Quality Level: Quality

This will automatically default your resolution to 848 x 528, don't worry, it genuinely still looks great aside from some tesselation with hair and fur. Intel XeSS presented some shimmering I didn't like as well as loss of a few FPS compared to FSR.

Graphics preset: Low

Motion Blur: Off (this is personal preference)

Expect approximately 3 hours of battery life on a full charge on the OLED, maybe 2.4 depending on how much is going on at the time.

The two quirks I noticed were the audio cuts in and out a little at random intervals, no real rhyme or reason behind it that I can see and not consistent enough to be more than a minor annoyance, and once while defending myself on the sled it froze for a few seconds and then played fine afterwards (game's installed on my internal ssd of course).