Out of box at 1280x800, game runs at locked 60 / 90 hz (SD OLED).

When Steam Deck is connected to an external display, default resolution is 1280x720. There is no option in-game to change display resolution, even if you change the resolution in the Steam Library properties.

In order to change the game's resolution, open the game's properties from Steam Library -> General -> Set desired resolution -> Launch options: -screen-width <####> -screen-height <####>

Performance:

1280x720 - Stable 120 fps

1920x1080 - min 68 fps, max 120 (menus or dialogue), 80 - 90 average FPS in normal gameplay

3840x2160 - about 45 fps, cap to 30 hz if resolution is more desireable than framerate

I did not test or optimize for battery life.

Controller glyphs are Steam Deck / Xbox with no options for DualSense or Switch Pro glyphs