Carbon Games' wonderful blend of arcade-style shooting and real-time strategy AirMech has come to Steam and is currently in closed testing. The studio has details on how you can participate over here, but the short of it is that you'll need to "like" their Facebook or Google+ account for a key.
Those of us who already have an AirMech account can link it up to this Steam version, though that's not a requirement. The game is nearing the end of its alpha and preparing to enter beta, but don't let that scare you off: it's still pretty great as is.
This news is good to hear if only because I don't regularly use Chrome and, as a result, keep forgetting that I could be playing more AirMech. Speaking of which...
[*].disqus.comto your security software's whitelist.