Actually the demo is a bit longer than that. When to get to the end of the ship section you fight a boss (some woman with 2 swords) and then you start another level, which like the earlier poster said, you have to have a bit of guess work. To start with i tried walking over the spikes like in the first game but quickly realised you have to roll over them. Then at the end, well i assume the end, you fight this massive boss (bout 5x bigger than you). You have to keep on your toes and get round the back of him and hack at his ankles till he go;s down on his knees. Then you use the space bar to run up his back and start pounding at his helmutted head.
Never argue with an idiot, they will drag you down to their level and beat you with experience..