Since GMS2 doesn't save how the surface actually looks like, but saves the opacity as opacity in images, I had to change it to be a color mix instead.
Shadowforge 1.7.1
Fixed mirroring. Fixed Blur Mix depth.
Blur Mix is now free
Blur mix is now free to use for everyone.
Fixed crash issues
Fixed crash from typing letters on canvas width and height. Fixed crash from opening a save file and pressing a few buttons.
Best friends for ever: blur & opacity
I changed the shader opacity to be 100% opacity when pressing on "Add Clear Assets". Lets be real, why have a configurable shader opacity from 0 to 1000 or something when all we want to focus on is cool art. Easy. "Add Clear Assets" does everything for you.