I don’t know anything about pixelated art styles , so i could be totally wrong. But since you didn’t get any answers so far, i can give a suggestion you could try and see if it works for you or google more in that direction.
About ur original idea of pixelated look, did you try “r.Upscale.Quality 0” CVar paired with “r.ScreenPercentage x” (50-70 for example)? I’ve seen people recommend that. And obviously you need to turn off antialiasing - “r.AntiAliasingMethod 0” or in the rendering settings.
“r.Upscale.Quality 0” - is the key CVar to make your low resolution sharp and not blury like you wanted.
I can’t really tell anything about Lethal Company, sry.