Changed graphics settings in-game: Quality to Low, Set Window to Fullscreen from Borderless.

This game is very polished and optimized. The hardware requirements on the Steam store are lying, you don't need something like a GTX 1080 to run this game. Changing the graphics quality to low will increase framerate, but the Steamdeck can handle the high quality setting with ease. Low just makes it a bit smoother if you prefer. Game supports controller input natively and works with the Steamdeck controls without any changes. No issues with audio or graphics, and no obvious bugs. There are some frame-drops here and there during the loading screens but they are not noticeable.