Flappy Bird wasn’t the first to even implement a game like this.
I remember playing a very similar game with a helicopter and another one with a worm long before that app released for phones.
Flappy Bird is just the game of this type that ended up going viral in its time.
Direct link to the video: https://www.youtube.com/watch?v=TnkXpJCoY9c
but the Tank Simulator also looked great: https://www.youtube.com/watch?v=NXGwaJBB_J0