hey sorry for my english i will try: (engine: unity) first directional light, sun effect, post process effects, and importants things, particles effect (dust effect, leaves falling effect, godrays effect), then sounds (birds sounds, footsteps), also trees movement sway and then you need to use some pixel effect but what I did was making it not too heavy or too pixel (you can find on yt searching "pixel effect render texture") and then I think nothing more, I mean everything is important so the union of everything make it, I think I could make it better because you will be always learning things. Again thank u so much for playing the game