For an absolute first, I gotta say you did quite well. If the art is all original then it's quite good, and the spirit of YN is definitely alive in this project. Plus, I'm a sucker for anything alchemical and occult.
If you were able to squash the bugs (I found a few), eliminate some of the stock rtp assets, tidy up your maps, and add some music, you'd have an absolutely kickass demo.
Keep at it! I'd love to see how this project evolves. :)