It's really great that people are still using it, after almost 6 years since the release! It was first announced here on HN: https://news.ycombinator.com/item?id=7468328. Fun fact: on the same day Facebook announced Oculus acquisition ;)
Also, sorry that the service was down for some of you yesterday - it's using a free Firebase account that has a limit of 100 connections - usually it's enough.