Southernmost Combine is an alternate story of the Half Life Universe in which Gordon Freeman is sent back in time to the 80´s to stop an early Combine invasion happening in South America. The mod consists at the moment of 5 levels and about 2 hours of gameplay. It´s been on development since 2008 with lot of breaks and revisions. There will be a few slight deviations from the orignal gameplay mechanics.
These are the first three screenshots published by Phillip in his Tumblr channel