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It makes me wonder, then, why Treasure (♥) decided to add this section of the game (to which I can't seem to find a similar one elsewhere). Level variety and their clever use of space aside, this seems apart from all of the other bullets-coming-at-you / creatures-crawling-towards-you stylings of seemingly everything else in the game. It could be that they originally tried out this bullet pattern and found that a closer camera made it too hard to see what's coming, or even the inverse - that their 3rd-quarter camera perspective allowed them to make more complicated patterns. And so they did.
The rhythmic pulsing of the bullet waves remind me heavily of a section in Chapter 2 of Ikaruga, shown here in a near-flawless run. The player must daftly maneuver through various symmetrical waves of bullets that need to be dealt with in one way or another. Although, in Ikaruga's case, the challenge here is in maneuvering through the unstoppable waves, while you were expected to obliterate the entire miniboss in S&P (to put things in very general terms, you dot-eating max-chainers out there).
Another way to think of this situation is to think of your character as a ship that has the added ability to "jump" (pun definitely intended) through different Z-depths, effectively dodging a particularly pesky array of life-stealing orange cones. True, this has been done before as far back as 1942 (the game, not the year) and Zaxxon (the video game, not the board game), but in this case you get to do it with a complicated control scheme.
Below, that very section of 2-1. I suppose this player wasn't thinking in the top-down fashion, hence the numerous errors. On the other hand, he seems to ace the subsequent sections, so I'm at a loss.
[cross-posted to Gamasutra] [continue]...