You don't even have to come close to finishing the game for this. You find it written on the wall shortly after escaping GladOs the first time. I didn't think it's even halfway through.

Huge success.

"I'm escaping to the one place that hasn't been corrupted by capitalism!...

...SPACE! 😀"

SPAAAAAAACE

Reptilian death ray!

The real trick to knowing someone beat it is when they recognize that the cake isn't a lie, because the credits show you the cake. You're never promised cake, you're just told that there is cake and the credits show it to you. Ratman never made it far enough to see the cake, which is why he thinks it's a lie

Ever since playing it this question still pops into my head every now and then.

• Come no closer, ghost!

• Should my best prove insufficient then we will find another way to achieve what’s needed

• One last explosion marks your fate as your ship is torn apart.

• Holmes versus Moriarty; Aristotle versus mashy spike plate!

• I'll leave you to prepare.

• Rock and stone!

• Faith, the train! Take the train!

What ! I'll have to look this up

Do a barrel roll

"Hear ye! Hear ye! Bishop Alexander slain by seekers!"
"The Axe? Noo, The Hammer."

"sigh ba panada"

You can't really finish it, but,

"Warning: Temperature critical"

::: The game
(Elite Dangerous; your ship says this when its temperature is too high, such as when hanging out by a star fuel scooping. There's plenty of other EXTREMELY quotable voice lines, but that one's super common and really stuck in our head.)

(another good one: "Warning: Frame shift drive operating beyond safety limits." accompanied by lots of lovely little beeps and creaks as your ship vaguely threatens to break apart (the game's sound design in general is SO good))
:::

https://en.wikipedia.org/wiki/Fourteener_%28poetry%29

and the line I quoted above fits the bill indeed !

I've played it for 15 minutes then I haven't touched video games for weeks. Does it actually get good?

Weird, it works on my app (Summit)

Love that! We still quote it

You have no chance to survive! Make your time!

::: spoiler What?!
You got it right. People are just replying to you with random other lines from Zero Wing, including "What you say?"
:::

::: spoiler According to the title, none of us have beaten that.

Impossible Mission
:::

It's my grandson, your rival. What was his name again?

Oh, right! BUTTHED!

yeah both of my examples there do not require beating the game. just playing.

"Death can have me when it earns me"

Interesting. I'm making a note here… 🎶

Thanks. I've forgotten. It's been so long.