Grandmyth has written
At the moment, this tool generates two layers - Shadows & Lights.
After exporting it as images (compressed - PNG format), you're applying them though CS2D map editor.
Light layer uses Light Blend Mode and 30% Transparency.
Shadow layer uses Shade Blend Mode.
Shadow layer should be applied over Light layer.
So, generated and exported layers looks like that:
Shadow Layer
Light Layer
These two layers has only 84kb size.