Actually, the game mechanic is deceptively different.

It looks and feels like those previous helicopter games where you hold to accelerate up. But it's very different, in that, you top to give the bird a sudden impulse. This is much harder to control with precision.

That's where it's addictive nature comes from... It's deceptive as in "oh I know how to play this kind of game, I can do this!" but in reality it's way more difficult that you estimate it to be.