The real gem in this game is that you need to think about the speed you move to the Kansas City. If you move slowly, you can use more actions on the buildings along the way but it takes more turns to reach the city for the big bonus. If you move too fast, you may end up with 'bad' cattle to sell in the city and may lose points. So it's quite different from the other engine-building games which usually more actions/faster movement means better.
There are also enough player interaction in this game, especially when you start to understand the position to place your buildings, and how you can ruin other players' plans.
I agree, this is what I like most about the game. It feels fresh. The deck-building I don't care for, but it's just one mechanism among many.
Excellent game. Probably my top of the year.