This is great fun so far, but I've run into a couple of possible game stoppers that I've managed to work around, just thought I'd let you know about them.
The first one is in the Orc Tower. After the fight with the dragon, you can talk to a slaver in the top left room. After I'd talked to him, some of the orcs in the room went hostile and I killed them. The slaver was still friendly, as were his remaining orcs, however one of them had wandered out of the room and was outside of the door.
Later, when I came back from the lower level, the slaver attacked, but the orc was locked out of the room, so even after killing everything in it, I couldn't end the combat as the orc was impossible to reach.
The second one is in the mountain pass. After killing the dragon and eventually finding the secret door, there are two sets of stairs. If you use the number pad to move into the second set, the game crashes, though clicking on them with the mouse cursor transports you to the world map as it should.
Another minor bug... (at least I think it's a bug) after bribing your way past the guard in the next town, walking forwards causes some the guards to go hostile (similarly to the slaver fight above). I don't know if this will impact anything later in the game, so I've stopped playing for now in case I should just try to fight my way into the town and possibly avoid another game stopper.
Thanks for the game so far, it's been great fun to play something that isn't resorting to A.I. cheating to remain challenging!