As a side note, Dong has doubled his Twitter followers in one hour from 7000 to what now is nearly 16000. Whatever was his real intentions, he is receiving media attention which will most likely last even after he pulls out the game.

You could speculate that he is trying to make a name for himself, so that the upcoming games would make him a stable income. As an indie developer he should know the fact that Flappy Bird won't last long - for example, Rovio is making over half of its income from other physical brand items. I'm not saying you will see Flappy Bird soda next year, but the games Dong releases later will most likely gain more attention thanks to Flappy Bird and Twitter is a way to make sure that the fans will notice it.