I've just browsed for a minute, and aesthetically, I think the trees/grass/water try to be realistic and they're too high-frequency for them to be pleasing IMO.

I've just browsed for a minute, and aesthetically, I think the trees/grass/water try to be realistic and they're too high-frequency for them to be pleasing IMO. Flat colored trees and grass, and simpler water shading would make everything more cohesive. It's like some things are minimalist / low poly looking (buildings, roads) and others try to be realistic (and kind of failing) and they don't fit.