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Can't seem to go into the options settings in the Linux version to tweak things, mainly the mouse sensitivity, and then save those settings and get back to the game without instead going back to the main menu which then fails to reload the game, or just accidentally exiting the game out entirely. 

In short, I can't figure out how to get out of the Options menu without killing the game.

Hi lambo.

Technically just press the ESC button to exit from the options menu and return to the game, that's strange... can you better explain your problem?