init python:
    from os import path

    def define_assets(mod_folder, sprites_folder):
        for file in renpy.list_files():
            if mod_folder in file:
                file_name = path.splitext(path.basename(file))[0]

                if file.endswith((".png", ".jpg")):
                    if sprites_folder and '%s/%s' % (mod_folder, sprites_folder) in file:
                            renpy.image(
                                file_name,
                                ConditionSwitch(
                                    "persistent.sprite_time == 'sunset'",
                                    im.MatrixColor(
                                        file,
                                        im.matrix.tint(0.94, 0.82, 1.0)
                                    ),
                                    "persistent.sprite_time == 'night'",
                                    im.MatrixColor(
                                        file,
                                        im.matrix.tint(0.63, 0.78, 0.82)
                                    ),
                                    "True", file
                                )
                            )
                    else:
                        renpy.image(file_name, file)
                elif file.endswith((".wav", ".mp2", ".mp3", ".ogg", ".opus", ".webm", ".flv", ".vob")):
                    globals()[file_name] = file