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Requierements
List of programs you'll need to make a mod.
Aseprite (Paid)

Pixelart program needed for opening .ase and other image files.
Buy Aseprite (Website) | Buy Aseprite (Steam)
Libresprite
Free and open source alternative to Aseprite, pretty much the same.
Download Libresprite
*Note that you can follow the same steps on Libresprite and Aseprite, there's no notable differences
Optional:
Audacity

Free and open source audio editor, needed for editing the Level Complete music.
Download Audacity