The original Flappy Bird game in coming to Windows Phone devices soon. It seems a 3rd party developer called Coding For Fun has created a exact replica of this game in Windows Phone Store. This is a clear violation of copyrights law, since this new game in Windows Phone Store copies the both gameplay and graphics of the original Flappy Bird game. Microsoft may remove the game soon from Windows Phone Store on the request of original game creator.
If you want to try it, You can download it here from Windows Phone Store.