Very original interpretation of the theme!
I liked the gameplay, but some moments were not clear from the first time. So I lost by killing Rose, because the dragon lost hp (it is not very obvious that the dragon is damaged for killing an apothecary). Also, I did not understand why kill someone if you can just turn back into a human and reset the timer (the amount of gold received is not worth it). In addition, it is not very clear why you need Smith and Rose if a Private collector gives the highest price.
The style is great, but I would suggest bringing the sprites to the same pixel size, adding highlighting to the text when hovering over it, and changing the font as other commenters below suggested.
Overall, this is a very original and interesting game!