This was some of my earliest Unity prototypes, and I was responsible for the asset acquisition, placement, lighting, texturing, and any effects that weren't purely for gameplay. If I were to ever revisit this one week project, I would use a procedural grass or at least a good prefeb grass on each island to make them feel more realistic.
Please refer to the Itch page for the playable and attribution of assets used:
https://aerismeadows.itch.io/rapid-prototype-delicate