I've been looking at this for a while, and they seem to be getting on well. (Yes, you're allowed to greenlight source mods). It has a bit of Portal 1 and 2 in it. So, rate it up to encourage Valve to greenlight it if you want.

http://steamcommunity.com/sharedfiles/f ... =188186007

https://www.youtube.com/watch?v=8sZjJhaABEg