By Liisa Tuhkanen LONDON (Reuters) - The often touted but regularly delayed stock-market listing of Rovio, creator of the hugely popular "Angry Birds" mobile game, could be even more distant after this week's warning of lower earnings and a planned cull of more than a third of its staff. While the mobile games market as a whole is thriving and looks set to grow to more than $35 billion in 2017, according to research firm Newzoo, Rovio's woes typify the difficulty established players have in changing with the times. "They lost their moment ... You need to list when your games are working well," said Thomas Alzuyeta, analyst at Gilbert Dupont, noting a drop in interest in the game franchise that debuted in 2009.

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