It is absolutely the right place to ask.
My Gameboy presets use a bunch of Mega Bezel tricks to try and make it look a bit like the Gameboy-DMG shader.
The preset in your shot probably uses plain LCD-GRID and the monochrome parameter.
To get it to look like this you would have to change a lot of parameters or edit my preset.
The latter is probably the easiest.
Make a copy of my preset (e.g. Gameboy-[STD]-[LCD-GRID]-[Night].slangp >> Gameboy-[STD]-[LCD-GRID]-[Night] - Copy.slangp.
edit the line…
// DEVICE :: CRT
#reference "../../../res/crt/GB.params"
to
// DEVICE :: CRT
//#reference "../../../res/crt/GB.params"
Before
After
Then turn on monochrome to “GREEN”, adjust the Saturation…
…and save a preset.