I'd pick a different quote: "Each time an update landed, new players would try the game, and its overall player retention rate would tick ever upward. “That’s basically it,” said Willard. “We’re a slow-growing company. We snowball our way to the top instead of spike and tail like most Steam releases do."

I also think he may be being slightly coy there. Most games, especially indie, do spike and tail because they receive a bit of initial interest and new release type promotion, people try it, and move on. But what matters is not most games, but successful games. And there's an increasingly dramatic shift towards long-tail revenue. And there your games does spike, people try it, word of mouth happens, and then your real growth pattern starts. Reach a sufficient threshold and you get a big bump because you end up getting featured on Steam pages, and from there the sky's the limit.