Just looking at the screenies, I'm really impressed by your maps for some reason - they seem very realistic and atmospheric.
Your storyline sounds very unique and interesting too - I guess I'm a sucker for assassins.
I'm really sorry to hear about your sister and I wish you the best of luck with this project. I would offer to help but I have to be honest and say I'm really busy this year. If the project goes on over next year then maybe that's a different story...