This is an actual review of the game from steam....
THIS GAME IS GREAT!!!!
I have no idea why the developers did not charge money for this game. This game is basically Half Life 2 with a few different mechanics. The game is even set in the same world. And with Valve not making HL3, this is as close as it gets. I have absolutly no complaints about the gameplay, story, or anything in the game. My only complaint is that the story is to short. It is only four chapters, but the chapters are GREAT. The engine is still the Source engine so no performance problems and a nice physics system. As I said above, this game is basically HL3 - YOU SHOULD BE DOWNLOADING THIS GAME RIGHT NOW!