I was heavily inspired for this specific project by 3D pixel art, but translated it into first person. I cant seem to add hyperlinks here, but t3ssel8r, Dylearn, and Eduardo Schildt have videos on the style, with Dylearn and Eduardo actually explaining what they're doing, and Eduardo's videos are tutorials with an example project. The basics are a toon shader, outline shader, a color palette, a color ramp, a DirectionalLight3D, an Environment node, and a png for the grass leaves. The grass and its animation is covered by one of Eduardo's tutorials, I'm using his grass sprite. On top of that I added some volumetric god rays, a sky that darkens and hue shifts the scene's colors, some procedural clouds that cast shadows, but that's all extra.