as far as ps1 to ps2 sequels for semi-obscure games go this is one of the better ones. which unfortunately isn't saying much. story is good, everything else is awful. It feels like someone wrote a pretty good story script but the devs really failed in transfering that into an actual game. most of it is walking through empty corridors and the edge is really toned down which doesn't fit with the even darker setting and story. essentially: no exploding heads or blood in this game.
I still somewhat enjoyed it, I love galerians and shou tajima