yeah i beat hl2 and the gman comes back and starts talking to you after the explosion, so you missed that, nothing big though. yeah.. first time playing, ravenholm freaked me out a bit to be entirely honest.
i downloaded the demo, and played it. it has the first level, and ravenholm. when I threw a flaming barrel at the zombies, they would start whining. im like "shut the f*ck up" its soo anoying.