Yep we are super early and still have some bugs. Could you tell me what browser you were using? B.c. maybe you did not give the browser the permission to record stuff with the microphone and then things break.
Agreed that this is very cool, this is a massive unsolved niche in the language learning market. Execute effectively on this and you've got it made. So I noticed that on MacOS Firefox, the app never asked me for microphone permissions and thus didn't work at all. But worked well on Chrome (which I only have for testing purposes).