Chrome 42+ disables NPAPI plugins like Unity3d plugin.
Copy and paste the following text into your browser: chrome://flags/#enable-npapi and enable the NPAPI plugin.
Or try another browser like Firefox
Do you get it done to drink a cup of coffee without spilling too much. Use the mouse and the A, S, D keys in order to get hold of the cup. Good luck with the Coffee Simulator 2015!