Awesome! I am using Godot an was looking for a tool to help generate normals for pixel art sprites, and was disappointed to learn that SpriteIlluminator apparently does not provide an option for y-invert. This is where Laigter came to the rescue!
Hi! i'm gald you like Laigter!
But to be fair, i think you can invert y in sprite illuminator, right before you export.