[Spanko]

The kind of roads used in Graal (Especially with Konidias' tileset) are very prone to getting overgrown with grass, so it's only logical to prefer non-straigth roads.
As for the houses, unlike the modern days it used to be the case that houses were pretty much designed like the builder preferred it, it wasn't globally planned by the government to build a neat neighbourhood with dozens of the same houses.