Hello—Sam here! I liked this piece quite a bit; transplanting Gatsby into modern-day collegiate New York is an interesting shift, and I think you preserved the mystery and allure of Gatsby-the-myth very well.
As for the pacing, the only issue that I noticed was some odd self-reflection; Nick talks about how he'd been at the party for quite a while and heard so much about Gatsby, yet to me, playing it, only a few minutes had passed. What I might potentially recommend as a possible solution is have more snippets of scenes (like with Jordan or the first drink or the weird library nerd), but shorten those snippets. Hitting the reader with a whole boatload of short, sharp moments will help the party and Gatsby-mythos have more space and time, but not actually much more in the way of word-count.
Other than that, I'd be sure to do another pass for sentence structure and clarity, and double-check your flowchart—I got caught in a loop where I ended up talking to Jordan twice. Still, your piece is working well, and I'd love to read more.