The controls and handling are easy enough but the shortcuts, dead-ends, occasional invisible walls and other gotchas make the tracks somewhat tricky to navigate.
From Wikipedia :
After years of prosperity, a mining accident unleashes a deadly fungus from within the mining facility, causing widespread destruction and panic throughout the colony. Desperate, most of Io’s population escapes the now-termed “p.o.d.” (planet of death) while a few survivors remain, voluntarily or otherwise.