Many people have tried to come up with a meaning for this game, but the creator has never given his opinion. Some people think that the game is a metaphor for addiction. The bird is addicted to the green pipes and wants to get through them, but it can’t because they are too hard.
The Bird is a metaphor for addiction, with the difficulty of the green pipes being analogous to resisting temptation. The player has to learn how to overcome their addiction and be able to fly through the pipes.