How do I use the --gotta-gomez-fast option if i play FEZ in Epic Games? There aren't launch options in Epic Games (I don't have the game in Steam)

You should have access to command line arguments by going in Epic Game's settings and reach the game's settings : https://www.reddit.com/r/EpicGamesPC/comments/k3bvao/new_way_to_change_game_launch_options_arguments/

Otherwise, you can probably go to the game's installation folder and create a shortcut, in which you can add the command line argument.