I haven't finished the game yet, nor read all the submissions here, but I'd like to chime in with a few thoughts for book 2. I really like book 1, so frankly, no need to make **major** changes, but perhaps some tweaks. Some of these ideas are truly wishes, and may not be realistic.
-Perhaps a bit more game balance, or options for characters playing straight fighters/mages etc. I am having to rely on hide in shadows to get through the game. I had too much trouble doing it as a hack and slash fighter (though i might just be doing it wrong).
- Weather effects? Snow, rain, lightning, fog? Severe weather affecting your character unless you have a cloak, seek shelter?
- Little more detail in terms of character graphics (cloak, different armor types, etc). However, I know that takes a *lot* of work to create.
- Ability to get a house, tower, fort in the game? Ability to defend said house/tower/fort.
- More varied monsters? Bigger monsters (more tile spaces used up).
- More "story", subplots, details about characters, monologues.
That's all I can come up with. Overall, I think your game, engine, graphics, sound and everything is excellent. Keep it up and I cannot wait for book 2!!!!