I'm glad you're continuing the series! I have yet to finish the first game so I don't know if some of these opinions will change later on, but these are the things I liked the most so far:
- The overall gloomy atmosphere
- Dungeons and their puzzles
- The world building
- Mapping
- The more open-ended sections of the game
I won't comment on the overall story and characters yet.
The biggest thing I'd like to see improved is that you'd give the gameplay your own stamp too. Either a mechanic to battles that is unique to your game or some kind of skill system. Maybe the skill system would be the biggest thing for me personally. I'd like to be able to customize the characters a bit more.
But overall, there's lots of potential in the world you've created. The biggest draw for me is that and judging from the snippets of graphics you've shown, the atmosphere will only be strengthened.