Is Shadowforge a "selfish" app?
Well. It is dependant on GMS2.3+ entirely, and that is why it can't save your progress as if it was in pause mode in a single file. There are games that have selfish classes, and I could perhaps compare Shadowforge to that. However, I have made it possible to save a project file for one single layer, and I believe that sharing a .SF file is great because I do believe that it will not slow down your computer, compared to a .png file with thousands of colors and brush strokes. Please use .SF if you have a friend that is using Shadowforge too.