Yes, I have gotten some response and interactions on GitHub. Even Sawyer X chimed in on an issue I posted. The project is not dormant, but it does have the feeling of a beehive in late autumn with a few bees flying slowly in and out. From my observations, which may certainly be completely wrong, the project was most active from about 2011 to 2015 and involvement has dwindled a bit.
I'm not sure what to attribute this to.
I did chime in on IRC and was pleased to see so many people there. Though you are right, response is a little slow.
So I'm curious to know if you are still using Dancer2 regularly and what you have done with it so far. Please let me know.