Why is a game about being a delivery boy so good? Is it the infrastructure building mechanic? Is it the batshit insane storyline? Is it the fact that every mountain is climbable? Is it the reserved use of combat and massive punishments for killing people?
Who knows, all I can say is I haven't had this much fun with a game in ages.
Oh yeah, the ziplines feel like cheating sometimes. Especially when you have high bridge link and get other people's lines. Literally get to skip entire sections of the map.