Hello. Can you please provide more information about your issue?
I've tested the game just now on Firefox and Chrome and it loads just fine. Are you using a different browser? What are your PC specs?
You can also use the Chrome menu to open the console.
Click on the 3 dots on the top right of the Chrome window, then select "More Tools" and then "Developer Tools".
In the new panel that opens, select the "Console" tab.
https://balsamiq.com/support/faqs/browser-console/#google-chrome