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The difference is that with the helicopter game, you have control over the vertical acceleration. With this game, the control directly applies a vertical impulse. Slight difference.

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Actually the addictive factor reminds me of a Joust on rails. Take away the left/right controls, and idea is similar to the 1982 arcade game. If you've never played it before, check it out on MAME.

This game is also much harder than the helicopter game

I still find Badland much more enjoyable and interesting.

I would really like to see the user engagement metrics for Flappy Bird and Badland, compared to install base.

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