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.
The constant shoulder button balancing is bad ergonomics, but I like the overall concept. Building roads and ziplines is the most fun. Traversal ladders and ropes are really fun too.