Wow! Looks fantastic!
Is there a way to use it for the whole screen and not only on the character's sprites?
Viewing post in Make Visual Novels! RenPy Shader Pack comments
Yep! You can apply the premade transforms to backgrounds, characters, or entire layers.
I have an update that will include an example of this, but in the mean time you can set the Mesh property to true on a layer(or a transform you make/edit) and apply it to an entire layer, which can include anything on the screen that you add to it.
The master layer is the one you'd want to apply a transform to most of the time, if you're doing screen wide shaders.