I like the pistol sound in this version. The Glock in the finished version sounded a little too powerful for a 9mm. It would make sense to have a silencer on the MP5 because you would go deaf from firing it in a metal corridor. The environment looks a little too futuristic though. Reminds me of Quake where everything looked brown and dirty, everything here is metal and clean.
Weapon and enemy attack animations are either unfinished or not present, bizzare and illogical architecture, NPCs look like they are made out of clay, texture artifacts and glitches. At first it seemed poorly constructed but then I remembered that it's a pre build of a game from the late 90's so it's excusable. Especially since the finished version left an such an impact on the industry.
Looks like Gordon isn't wearing an HEV suit. I wonder if they didn't model it yet or if it was added in later.