Another thing that wasn't mentioned in the video that Proton does is it also -- sometimes, depending on the game -- checks a list of known requirements for a game and installs them through winetricks, or makes other recommended changes to game files that are known to make the game work.
When Proton is updated and the patch notes mention that a game was fixed, it's something to do with this part of the process. A certain library, or whatever was missing and Proton installs it for you behind the scenes.
It also runs WINE through Steam's launcher (aka Steam Linux Runtime) which has some common redistributables (aka Steamworks SDK Redist) built right into it, and it also runs appropriate anti-cheat solutions (aka Proton EasyAntiCheat Runtime or Proton BattlEye Runtime).
I don't know if this information is already public but here are a couple of quick inferences I made by looking a the files. I'm not overly familiar with Valve's intellectual properties so I don't recognize any specific characters or franchises.
There's likely a hero named Yamato who has the abilities:
Shadow Form
Power Stance
Infinity Slash
Healing Slash
Flying Strike
There's a lot more hero information but that's the top one in the depots.
The game might be called "Citadel", or it may have just been called that internally at Valve.
The reason I suspect that is because of there appears to be a game folder called "citadel" which appears to be the main game folder.
I would argue that Bioshock is one of the few video game franchises that would probably do well in a non-interactive story medium. It's a very story driven video game. As long as they trust the writers to respect the source material and come up with a compelling story, I think it could be great. There's always a chance that it's a disaster though.