The author decided he preferred peace and quiet over leaving flappy bird in the app store.
http://uk.businessinsider.com/why-flappy-birds-shut-down-201...
http://uk.businessinsider.com/why-flappy-birds-shut-down-201...
https://play.google.com/store/apps/developer?id=DOTGEARS
He also made Ninja Spinki Challenges, which I really enjoyed for a while and has some really cute graphics:
https://play.google.com/store/apps/details?id=com.dotgears.n...
This appears to just be Flappy Bird rotated 90deg [1]. Pretty funny!