I've had a bunch of people asking the same question of why the title is about knightmare when the video itself is about milena, so I'm going to paste an answer I gave to another comment:

Yeah this script was very hard to write. Nobody really gives a shit about ultimate chicken horse, they care about the story that can be told through it. I didn’t want to tell a story that was just “she beat this map, and then she beat this even harder map, and then-“ but when it comes to challenge clears, that’s basically what the sequence of events looks like. I also don’t want to just make things up, so I needed to find some way to frame a real sequence of events that tells a good story.

People don’t care about UCH, but they REALLY don’t care about challenge clears, because it’s just somebody in isolation playing on their own. There isn’t enough conflict to tell a good story, so I need to instead make people care about the character. And people care more when there is emotion attached to the narrative. By structuring the video this way the first time you are introduced to Milena, there is emotion to go along with it. You immediately care about what she's doing in a way you otherwise wouldn't, because she is being attached to something else that invokes emotion. And this is Enough to keep people watching for long enough that I can give them a good reason to care about what she’s doing.

I tried SO many ways of structuring and packaging this video, but ultimately the only thing I could really get to work was this. I also just generally think subverting expectations is useful from a storytelling perspective, so a twist like this works well. And this twist requires that the viewer expects the video to be about knightmare, not Milena. At the end of the day I think the best outcome for Milena and the UCH community (and myself of course) is that a video does well and has a broad reach so that I can tell more people her story. Also I'm sure some people will see this and ask something like "Why can't you just structure the video this way, but make the title about Milena", the answer to that just has to do with packaging. If you want a video to do well on youtube you can't afford to think about the title, thumbnail, concept, and content as separate entities. They all work together to create a specific experience, and for this the title felt necessary.

"You wanted the map to take 300 hours to beat?  You will need to make it harder." is truly peak aura.

Knightmare taught me not to pick a street fight with random strangers

It's always interesting when the narrator becomes a character mid-story

Making the hardest level in the game then beating it with the flu is Goku levels of aura

Morphin becomes the protagonist of UCH after beating full-power Raito with the flu, Milena beats the new hardest level in half the expected time with the flu...

The true best UCH player is Influenza

Imagine practicing to beat the hardest map ever built and being close to actually beating it, just to come up to the mapper like "Yeah, idk... Could you please make it even harder?".

Bojack falling in love with every indie game ad he does is amazing

These videos remind me of what fitmc did with 2b2t back in the day, taking this niche community for a game and using content to mythologize its stories and popularize it for a wider audience

milena when she failed to complete all of the top 10 so she just makes a new, far harder top 10 and beats that

how come people are always doing record-breaking things with the flu in this game

milena really did just say "too easy" to one of her greatest challenges

2:06  If he comes form Mario Kazo, then don’t be, that stuff over there is scarier then over here

What an absolute mog from Knightmare. Glad to see folks took it personally.

Very nice video, glad to be a part of it! Maybe I’ll come back to play PH5 someday…

who grinds the same level for hu- TWO hundred hours, then goes like "hmm, you know what would hit the spot right now? hundred grind hours more"

Milena is such a beast, she made herself a household name by applying and challenging herself to be better

"I wanted to make the hardest challenge run map"

proceeds to show an average Apples game map

Seeing the tree without anything is weird

If you want to be among the stars, shoot for the moon. If you miss, you'll be where you wanted. If you succeed, however, you will be greater than you could have ever imagined.
Melenna managed to land a bullseye.