Upon closer investigation, the FFV pixel remaster graphics are literally the GBA graphics (at least for enemies and backgrounds) scaled in some arbitrary way that I don't understand (GBA's aspect ratio is 3:2, but they didn't scale it to something standard like 4:3 or 16:9), then expanded via what looks like the Photoshop smudge tool + some kind of pixelization filter. Pic related is the GBA graphics superimposed onto the remaster. The blurry repetitive tree and grass textures fading out to the edges is what was added in the remaster. They also didn't do any color correction to compensate for how oversaturated GBA games were.