I will try it if I do not find another solution.

I found the steam library file but when the I delete the file the game crashes. With the heroic the game just crashes after a long black screen. No info on db or itch.io I left a comment on itch.io. The game is native Linux so no proton is needed. Maybe I should try running the windows version.

I am not sure the game has DRM it seems more like Steam recognizes it as game from it own store and thinks there should be a license for it. I could be wrong though.

I avoid those games. I get motion sickness no matter the screen size. As for Half Life 2 I remember when it was first released there were many reports of people getting motion sickness and the recommended solution was to increase the FOV in the game settings.