This was the full release of the game, before the updated Alien Seed Games version. NOTE! There is no support for this version, as it differs greatly from the current Steam release.
This is the old version of Area 51 Defense, when it was still in Early Access, and before the major update that Alien Seed Games developed for the game. NOTE! There is no support for this version, as it differs greatly from the current Steam release. There might be stability issues, and issues with the controller.