FPS limit set to 40
It seems that sometimes there's some delay in the game processing data from controller because it's easy to fail in some scenes that require precise movements and timing. And you need to replay it again and again. However it's supposed to be easy, because the game is not such difficult actually, and when you see on YouTube how people pass all the game easily with mouse and keyboard, you feel depressed that you have to deal with several repeats with Steam Deck controller.
Very rare crashes.
The game works well with standard Proton, but GE seems to work more stable and smooth.
Was able to play the entirety of the game in Proton with a controller, no issues.
The Uplay launcher and it's required updates were clunky, but once past that gameplay was smooth and enjoyable.
You'll have to quit Uplay in order for Steam to know you exited the game and disable Uplay overlay, as it's glitchy.
Works on Proton perfectly fine with DXVK. I disabled the Uplay overlay to avoid issues with the additional launcher (which should be removed from my point of view).
The game worked perfectly fine. I managed to finish the first chapter with any issues whatsoever.
I tried to disable full screen but then everything became transparent, I had to kill the process from the terminal.
Before launching I disabled uplay's overlay just in case, because I read that it used to gave problems in other games. It might actually work anyway, it was only a precaution.