nice work. hm, if the brightness works good on your ipod, why not just brighten up the pics you show us on PixelJoint? just to ensure everyone knows how your game will look like while playing.
ah, one crit: i dislike the menu window background pattern, and the font. doesn't fit so really.
That's a great tileset, though I agree with the others about the twilight lighting. If the game is not going to have brighter elements with it (moving characters, flags, icons), then I'm afraid the whole graphics will quickly seem dull to the player.
Simple, but nice anyways. :-) I like it's (lack of) brightness, if I see it as a "stylistic device". 
Oh, I know. It looks a lot better on an iPod Touch's bright screen, which is what it's intended for. Thanks though. : )
Hmm, it's all way too dark. You working on an irregularly bright mon?
Hmmm, interesting that the mansion is surrounded by such a thick fortress wall... I like the small details everywhere... and I assume it's at night time right?