Well this game was coded in Processing but the page I shared using Java so you shouldn't have problems... I don't know why you are getting errors, sorry!
You guys here on the Kongregate site are the only ones who have problems with the controls! There is an 'Instructions' section in this page where you can find out what to do. So for the sake of weaker: Use W,S to navigate menu and SPACE to select option. And read the god damn help screen! Thank you! :)
 "Gems of the Evolving Land"){kind=icon}