I don't really think it's like Flappy Bird at all, the game is way much harder to predict and it does add the excitement because of that too. It was very fun spamming the up or down key to adjust the barrier and the soundtrack was pleasant to hear. However, I think the game would benefit massively from being able to go fullscreen since when I pressed up or down, the website also moves, which makes it confusing.
Also yeah, rng as others have said.