Information: Garry's Mod - Deltarune Hometown Map
Development Screenshots
Whole load of images, ordered by date.
The Outlines
One of the most visually striking elements of this map are the outlines present across the overworld in many models and buildings.
These weren't made with post processing, but rather the solidify modifier in Blender. Yeah, I used the old school outline method.
Many of the models in this map are brushwork directly converted to models with the Source Engine tool propper, but the buildings are different. Their bases are Brushwork, but they have a black shell made out of a model.