Quick question: Why do I have these images in my game files?

I got there to see if I could hack the game to restore the first-time menus (if anyone knows, please do tell me) and I found them. I don't even know how they got there or what they're for.

Teaser. Song by Youtube Fazy, I believe.

I've been working on something. Something big. Something, I hope, you will find

fascinating.

Truly,

fascinating...

So...

It appears we're early, huh...

...

...wait.

...Early?

Early to what...?

Undertale, but nothing's wrong.

So, I don't know if anyone else saw this, but in Toby's Spotify, BIG SHOT's lyrics appear. And I don't know what the [Fifty Percent Off] that means for us...

Asgore crying sad clash royale emote

By AntO the Clownest

* You looked into the mirror.

* ...

* It's only you.

A taste of what's to come. It ain't much, but I'm doin' my best from over here!

UTDR Styled - Arcadia OCs 2

Ok so, has anyone ever thought about what it'd be like to fight UT bosses in the style of DT? My future project tries to achieve just that. Although it won't have in-battle dialogue, I hope it becomes something acceptable. (the sprites are of Askywalker).