I really loved the art style (both characters and backgrounds).
In my humble opinion, here is my suggestions:
* Our character can walk faster, maybe.
* "Convince the merchant about price" part is a little boring in current state, of course you can improve it (I mean I believe you can manage it).
* It is a "very big maybe" but maybe you can add mini games (like dice poker in Witcher 2) for dialogues? So if we win the game, we can learn what we need. I actually suggested this for destroy the monotony for dialogues and add some fun.