Very simple.
Horizontal ones are strictly 2D. Vertical scrollers have an implied down element. Even if it isn't used to bomb things with, the mind thinks those things on the ground or in the ocean, etc, are down. And that makes the game more interesting.
One exception is Moon Patrol. Why? Because you [are] on the ground. And you can jump over stuff. Gravity.
Scifi frauds. SF illuminates.
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Culture General Contact Unit (Eccentric)
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