Mobile gaming is notorious for clones. There must be 100's of Angry Birds copycats out there (not that that's such a bad thing).
Have you tried Timberman, @robjama? It's also a frustrating/fun/addictive game.
Here's another simple addictive game starring you guessed it....a bird. Reminds me a lot of Flappy Bird.
Back story - apparently this is a clone of another game called Bouncy Ninja based on what some users are saying via app reviews. The ninja was replaced with a bird which is a classic move. Not sure what it is about bird based games and the App Store but they seem to fly up the charts.
This is the same developer that cloned 2048, which cloned 1024, which cloned Threes.
Product Hunt
Boom video