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When I press launch, there is a window that has three versions of the game to play. I press the Linux version. When I do that, another window appears saying, "An error occurred while launching Tomboy Simulator."

You are using the itch launcher for the game?

Yes. I am using Itch to launch the game.

You could try directly downloading the linux version from the site. Might not work but it could give a better reason as to why it fails.