Ask HN: Has anyone here programmed in Kotlin? What do you think about it?

I was looking at Kotlin and was curious. It looks very interesting feature wise but I worry about its long term viability given it's low presence on GitHub[1] and < 40 users on #kotlin on Freenode IRC. Is this worth writing a big project in?

[1] https://github.com/search?o=desc&q=language%3AKotlin&ref=searchresults&s=stars&type=Repositories&utf8=