The memories of this popular game are still fresh in my mind. I bought my first Android phone in 2011 and this game was quite popular at that time. I used to play this game a lot and became addicted to it. I agree with you and I think the main reason for its downfall is over expansion. No matter how many games somebody brings in the market but if their concept is similar then nobody likes it, in such a case the user gets confused. This was just a few years ago, I felt like playing Angry Birds so I searched for Angry Birds in the app store and I was shocked that so many versions of Angry Birds game had come up and I was confused as to which one to play.