This game looks nice, Metroidvania style is always good
For light and glow effects I used a different approach. The graphics are all drawn like they are well lit. Then I overlay everything with a black image (opacity as desired, in my case i let it slowly de- and increase between two values)
Over that you place a black and white image (white = light) and set propertys > effects > blend mode on "Destination out" This will cut the white parts out of the black overlay. Then I simply added another image with color to give the light a color (I used the Dodge-effect there)
It´s simple and gives a really solid effect.