“Core statements” (sometimes called the game’s “vision”) are usually written by the development team to reflect the core mechanic or the core dynamic and sum up what the game is about, often in a single sentence.
“This game is about...”
“This game is the experience of being...”
“This game teaches...”
“This game simulates the experience of...”
As is well known by those who have tried to pitch their game to a publisher, if you can’t sum up your game in two ...
To start with one (or more) of the above statements seems to be a good way to capture your vision and also give you, the designer, a path to pursue while developing the game. I think it would keep you focussed.
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