Eric Barone, who goes by the handle ConcernedApe, is Stardew Valley's sole developer. He programmed the game, wrote the story and dialogue, created all art assets as well as all sound effects and music.
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Setting your favorite thing when starting the game to ConcernedApe will trigger special dialogue upon consumption of a Stardrop.
When launching Stardew Valley if the player clicks on ConcernedApe's face he will open his eyes and either a 'splat' sound or the sound of a goose honking will play.