I have swapped the better in my opinion, Unreal version of the game, to the main game.
All other versions of the game are available via the game's "Properties" menu, under the "Game Versions & Betas" section.
The unreal version is theoretically playable on steam deck and machine. But, I have not tested it lately cause I do not have a copy of Linux installed and do not have the steam hardware to test it either.
Don't forget if you wanna see something appropriate added to the game, leave feedback, it is always appreciated.
Thank You