If you spend 30 seconds looking at the reviews for this app it is clear that they are mostly fake. I don't understand why that part is being shuffled under the rug.
It was part of a twitter "worst review" type thing so people piled on. At least that's the theory:
http://www.thechocolatelabapps.com/is-twitter-the-fuel-behind-the-success-of-the-1-app-flappy-bird/
it's like the amazon milk review phenomenon: http://www.nytimes.com/2006/08/09/technology/09milk.html?_r=0
people try to outdo each other.