Did you follow any tutorials on the glow? I've got a game project in Godot that I would like to try lighting in!
Yeah there are some tutorials on YouTube but they are a bit lacking…I’m thinking of making one myself…the main idea is to use a worldenvironment node, set it to canvas mode, and turn on glow. Then from the script you can set the modulate value of any object to a high number (more than the HDR threshold set in worldenvironment node) and it will glow on screen…for example modulate = Color(4.0,1,1) will make it glow red…I hope this helps :)