None of that really required an act of genius creative talent, though. Learning enough about audio production to create the set of SFX and music you already know you need from the top-down design of the clone-game you already know you're aiming for is effectively "just" grunt work. Sort of like how an actor learning the exact set of martial-arts moves they need to know to look like they know martial arts in one particular shot, which is intensely choreographed, is "just" grunt work. Stardew Valley's creator didn't need to develop the skills to be an amazing artist or musician, they just needed—like the actor—to develop the skills to create a particular pastiche of existing pieces of art and music.
The creator of Stardew Valley is, however, a natural talent at the particular meta-skill of "finding out what people want and tweaking things in response to those wants, never settling for doing 'merely' what they know how to do with the skills they already have, rather pushing themselves to the skill-level required to make people even more happy."
Would almost agree but you had to bring up this :). I actually talked with SDV developer about his music skills[0]. Turns out, music was his hobby prior to becoming a developer, so he has a lot of experience. So in this case I wouldn't say it's "just', and it definitely wasn't a skill developed for this game.
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[0] -- https://www.reddit.com/r/StardewValley/comments/4acds9/how_d...
I don't think so. The author mentioned in one of his interviews that he was the only person to actually play the game until the very late pre-release stages. Even those who signed him haven't really played it.
