On my next try after typing that post, I beat that stage (that part I described turned out to not be exceptionally difficult, or so it seemed). However, it didn't "count", because I did so in the score attack mode.

I just played through the game and made it to that stage, but I died early in it. There's one thing about this game that can annoy me (and it's what I blame my death on) (though, truth be told, usually it's more of an abstract annoyance, in the sense that I dislike how it could kill me, although it rarely really does): When you blow up some big things in this game, their explosion is so bright that you can't see what's going on. If you blow up two large ships (of the the type that are in stage 5, or C), the combined explosion will make the entire screen white. You still are vulnerable during this time, but you can't see any dangers.

Well, it seems to take about 40 minutes to play through the game to make it that stage, so I'm calling it a night.
I LOOOOOOVE Flying Omelette!!
Crawl and 1000