Sorry about that! If you refresh, go to your dashboard, and open the course again, it should now work 🙂
When I released a new version of My Little Word Land to let people upload audio, I also included some changes to help courses on My Little Word Land rank more highly in search engines. Those changes didn't account for courses that had square brackets []
in the name, like the course that you posted. This should now be fixed, and this helped me catch some other similar bugs, too. Thank you very much for letting me know, and sorry for the trouble! 🙂