sorry
... Wait, many people did this joke already, oops.

I got FL Studio a few days ago and this is the first thing I do with it. :^)

Tools used:
FL Studio: https://www.image-line.com/
Boyfriend Chromatic Scale: https://drive.google.com/drive/folders/1XndrqjB48K3HTj0V3l0HSUGtCttRfiH9
Megalovania MIDI: https://sites.google.com/view/ironinvoker47/transcriptions/undertale