Jenga said:
All of those sound extremely out of place except for better carts :lol
What about them sounds out of place?
The game is primarily about two things: exploring, and building.
Better carts: building (this is obvious) AND exploring (getting around faster)
Alchemy: building (make new materials from old) AND exploring (discovering alchemic spells or whatever)
Random content in caves: building (build around these new awesome things!) AND exploring (this is obvious)
New monster: building (to protect) AND exploring (to discover)
Flyable mount: building (fly to hard to get places and build) AND exploring (this is obvious)
Biomes: building (want a castle on a snowy mountaintop? OKAY!) AND exploring (want to discover a snowy mountaintop? OKAY!)
Animal husbandry: building (make a barn!) AND exploring (keep a mount around permanently!)
Fishing: building (build some docks!) AND exploring (find good fishing spots!)
Diving: building (build underwater structures!) AND exploring (this is obvious)
U:
If you wanted, you could also tie "survival" into all of those things, but really aside from the first night monsters aren't yet a real danger.