This song is my personal favorite Undertale song, so when I realized no one had mapped it already, I only felt more obligated to get this out there.
I truly hope you enjoy.
P.S. – Play this map with the origins environment for the intended experience.
Song Info: https://undertale.fandom.com/wiki/Reunited
Get Undertale Here: https://store.steampowered.com/app/391540/Undertale/