The game has a problem with multi-lane intersections and anything besides straight roads meeting with some lights in the middle is not really possible at the moment due to bugs, meaning you can't try out those juicier intersection designs. I also think the entry and exit arrows should be two tiles further back, as you can't place arrows immediately following each other, rendering the outer two tiles of the map mostly unusable.
Anyway it was two bucks and I had a good time for an hour or so so that's nice.