Made a new "src" folder that will contain the source code files, like all the GDScript and scene files. Please read this for more details: https://www.gdquest.com/docs/guidelines/best-practices/godot-gdscript/
It made no sense to keep scenes separate from their scripts. More file organizing will follow soon.
One bug was that rotxel was used at the end, no matter what algorithm was chosen.
The other was that rotxel was taking into account a image of width x width dimensions.