Well, there isn't much. Other than the underused multiplayer. (does ANYONE ever play it). The graphics aren't that good, but what would you expect from a old game?
In the end this game is a good buy. It might be a bit old, but it will intrigue you till the very end. From start to begining this game has an immersive, introspective storyline that pulld you in. I gave this game to my friend a year ago, and he still talks about it. (If you really want to know what happened to the Halley space station, choose Bora!)