Danger Close! is now available on Steam as well, and I'm glad for it. It's been one year and three months since it making it through Greenlight, but for various reasons I haven't been able to integrate it with Steam until now. I've made a longer post with more information about the release on my blog here.
I've tested the game ad nauseam so there should be very few bugs, but please report if you find any as a comment to this announcement or through any other appropriate channel.