Not to sound harsh, but one of the key components of auto-scrolling segments is to spend the time entertainingly. It's typically difficult to always know what is entertaining and what isn't, but do compare my abandoned run with yours and tell me which one catches more of your attention.
It's great that you go for fastest possible (
auto-scrolling, eh...), but that alone isn't enough in auto-scroller segments. Kill every enemy possible might help, maybe. But there are times you just stand there. There is a time you kill an enemy without giving it a chance to show off its flashy moves, and in the moments that follow, you actually have nothing to do. And the music is entirely ignored.
There is something written here in an effort to raise awareness of what to do when the only thing you can do is wait. Look under
Create art even when waiting.
At least ask yourself this: Even when there is nothing of note happening, do you get that sense watching the runs?
Again, it's difficult to really get a perfect sense of what is and what isn't entertaining. But now that I said this, would you be willing to try that opening Corridor again with these thoughts in mind? I don't expect your habits to change overnight, but try listening to the music and see if you can act in time with it. Better if you can kill some enemies distinctly to the music, too. Without interfering with getting to the end, of course. If leaving an enemy alive (longer) will have more action going on in the screen, keep it alive long enough to see that action.
There are certainly people hoping to see the run produced eventually. Keep trying and see if you can train in a new sense for entertainment! I can't say it's easy, but if done successfully, its beauty is rarely matched.