Advanced fighting/battle system

Weapons (ranged or melee – eg. crossbows, swords, daggers)

More siege weapons (ballista, battering ram)

Enemy AI attacks (barbarian raids)

Constructing buildings in survival mode (using gathered and processed materials)

Crafting (using furnace and workshop to process ore and create materials)

Wildlife

Commanding AI characters

Better terrain generator with more biomes and ore materials

Fire that can burn stuff to ashes and spreads

Food, drinking requirements (farming, gathering, hunting, food storage, water)