For starters, the plot is adapted from a Chinese 16th century novel called Journey to the West. The work was done by Alex Garland – the bloke who wrote The Beach. That’s a better starting point and a better writer than almost every videogame that’s ever existed.
The story doesn’t take place in dynastic China – instead, it’s set 150 years in the future. Most of earth’s population was wiped out in a war with angry robots, and the few survivors scratch a living in well-defended communities, fuelled by paranoia and survival instincts. The remaining robots roam the broken, overgrown remains of an increasingly unfamiliar world.