Run a new factory every day making new items in each one. Put the items together then ship them, make sure you don't break anything or else you'll lose money! Can you be the highest earner?
Control the switchs and containers with a mouse to make the required items. Switches can also be controled with the number keys. Going through the tutorial before you start is a good idea.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.