Ian Cheng Art Style

I’m a student working to simulate animal behavior using the unity engine, and I recently became enamored with an artist called Ian Cheng. Specifically, I love the art style of his simulations, images of which are provided below. It seems low-poly, but there’s a specific sheen to it, more plastic than metallic. It's really simple but it’s hard to recreate. I feel like there’s a game I’ve played before which has the exact same art style, but I can’t seem to find it. Games like "Abzu" and "Grow Home" are similar like low-poly style but they don't have this same sheen or sleekness - I can't really describe it. Do you guys have any advice on shaders and 3d modelling techniques for replicating this?

 

Wow! That is a really interesting artstyle.