How do I use this?

Hi! I tried to play around on https://fuiz.us/ and ran into a couple of issues:

• pressing Start on this page gave me a "Validation error: config.slides[0][0].media[0].id: length is lower than 16" error message (in the window, not in the browser console)

• I tried to join a game from a different browser and copied the URL instead of entering the code; it didn't work too well (I got a spinner and had to refresh a couple of times), but I don't know if this scenario is supported
• during a game, I can't press the answer buttons; I see the click effect, but the game doesn't advance until the question times out, nor does it give me points for my answers
• at least in Chromium, I noticed a "Uncaught TypeError: Cannot use 'in' operator to search for 'WaitingScreen' in NameChoose" message in the console

Tested mainly on Firefox/Linux.

I can test it some more, just ping me if you need that.