Here's my addendum; we're down to three short, and two of those are technicalities: https://www.youtube.com/playlist?list=PLjggKtuoASrJyA2SJ16FFoUKYRZYk_DQl
Disco Descent remixes are abundant, which actually makes it harder to pick one out for something like this; I assume you had similar difficulty, since you don't have it represented either. I can't accept that Steinway to Heaven remix; it simply doesn't match the quality of the rest. Which leaves Dead End, and good luck finding an unattached remix of that.

I'll have to check what part 1 uses, but in the meantime this is what I know of from the original project: https://www.youtube.com/playlist?list=PLjggKtuoASrLIklsDZXNdLxsA5wxtyfWQ

Peeeeeerfect soundtrack with a massive mix of genres. Love that

Still looking for original remixes for the rest of the game, so lemme know if you or someone you know has one.