
I didn't played it in Steam, I have it in Heroic Games. Works ootb.

Works ootb.

Definitive edition works excellent on Deck. Very minor technical hiccups aside, game runs right out of the gate without configuration.
A few times across the whole playthrough combat would randomly slow to a crawl. Extremely infrequent.
Game crashed exactly once across my whole playthrough. Didn't lose any progress, but might have been frustrating if it had happened with worse timing.

volume is inconsistent. the problem may not be proton, tho, given recent reviews. also, the changed the best song in the last update :(

Game works great if you use Proton. You technically can play the Native version, but you won't get the new Definitive Edition content.
5 Watts, 200 GPU
Used Proton 8.0-2, listing it here since you STILL can't mark that as a version on here. Tested Painful up to the first save point and haven't tested Joyful.
A excelent native port
I didn't have any problems.
El juego funciona bien de forma Nativa, En caso de que no abra en Arch Linux probablemente tenga que instalar libxcrypt-compat
Si no te abre el juego es probable que necesites instalar el testing/libxcrypt-compat sobre todo en Arch Linux
sudo pacman -S core/libxcrypt-compat
Only problem was during Dismal Island where I had to modify Brad's name, I had to press "X" on my Bluetooth keyboard just to delete characters because it didn't recognize the Steam Deck's virtual keyboard. Maybe mapping a "X" button on your controller layout could work as well but can't confirm.
Works perfectly.
Runs natively with no issues that I have noticed. I am able to start and play Joyful from the launch menu as well.
This is supposed to be a native Linux game, but I couldn't get it to run with or without Proton.
Pressed play on Steam, but the game immidiately closes. Tried with and without Proton and the same thing happens. Considering it's a native Linux game, it really is strange that it can't run either way.
Map Alt+Enter to full screen the game when you start. It won't remember that you had it full screen last time. This is important for Steam Deck users who have no real keyboard.
Some text is pretty small and may be hard for some to read.
If for any reason you need to use F1 to change something, do it in Desktop Mode. Game Mode has issues with Gamescope because this is an additional window.
Yes, Steam Deck can't Alt-Enter to full screen unless you map something to that.