I played through it and I gotta say, the quality is there!
This SP mod is well-made and well-paced. It re-uses areas intelligently, and obviously has good planning and playtesting, as the gameplay and environments don't get boring or repetitive.
The voice acting and scripted sequences are a must now IMO for SP levels. I may not have been able to follow why I was there, or where I was if it weren't for the characters talking to me directly. I think they drove the story along quite nicely.
I will say though, that this mod didn't follow the gameplay conventions of HL2 in that, halfway through the end of the game, it's like the health packs stop. Usually in HL2, they'll place small health close together and not far apart. There wasn't any health (except the stuff dropped by fallen Combine) leading up to some of the big fights. And because of this, I died often towards the end. It was way too hard because I was working with 10 health or less. I managed to get by after many attempts on the harder parts and I think I finished the game at like 33 health.
Other than that though, this mod really put you in the mood, and the beginning was very fun to watch. It was very, very well scripted, and the Gman's voice was done really really well. After hearing it at the end, I didn't notice it wasn't the original.
Thanks for uploading here! I enjoyed playing it!