Maybe it's not bad for 20 bucks, but I was and still am a huge fan of Xenogears (since before the game came out and it was totally obscure) and I still haven't finished Xenosaga. It's not really an extension of XG but more like a plagiarism. A lot of the terms (all most all) are featured in XG and some themes are similar but I don't relate the two games at all past that point.