Very nice!
I haven't gone all the way through it, but a couple of suggestions:
1. As someone who's played UW1 quite a few times, I recognized when the Introduction cutscene started looping... but someone who's new to this game might be confused by that.
2. At the bottom of each page, you provide a way to mute or lower the volume of the music that plays. This is nice, but even nicer might be to give your visitors a clear option at the top of the very first page of whether they want music to play at all.
One other possibility might be a page dedicated to the Easter eggs and in-jokes in the game. Overall, though, you've done an excellent job of providing the information that a new player of UW could want. I particularly like the Must Do / Should Do / Can Do sections.