I really love the style of that game, somehow midway between cartoony and realistic, and the latter image also having a very clear "it's 2003 and we need a modern plant" style.
I really want to do an isometric game in the style of SC4 at some point, or at the very least make little buildings in its style.
edit: i've tacked on the final render of the paper mill as it appears in the game for comparison!