To target a broader market, you might consider dropping the "Vim built in" and explain it as "Create stories efficiently in plain text with our editor that uses

To target a broader market, you might consider dropping the "Vim built in" and explain it as "Create stories efficiently in plain text with our editor that uses familiar key bindings from Vim. Alternatively, use your favorite editor and paste the text in. Phaser's story parser will slurp them up for you."