I just wanted to share my creation and how I made it. I used MultiLayerEarthboundBG (mleb) to create the background, and I had to tweak it a bit, so I just packaged it all up in a nice zip with some other stuff!
Credits to Emral and MrDoubleA for the scripts in this zip.
Extra credits to "ThatBratCohen" on PixilArt and "Toby Fox" for the actual game itself and the OST used.
Here's a video showcasing it if you don't wanna open up the level yourself:
This is insanely cool!! Funnily enough I was just trying to figure out if it was possible to make this just the other day, but I couldn't find any of it's assets besides the unaltered carousel background taken straight from Deltarune's files, so I had given up hope. I can't say I expected to see it a reality so soon