This is easily the best jam game I've seen so far (of this jam and any other I've been apart of). It looks great, is fun to play and explore, and feels good, even for something put together in a week. I'm not really one for Souls games myself, but if you turned this into a full-featured product, I'd buy it and play it.
One interesting thing that I did notice - and I don't know if this is either a positive or negative, really - is that this game made my computer work, and given that it's a fairly new machine with some decent hardware, I found that surprising. I'm not sure if that's a graphical optimization issue or some other intensive processing issue, but I thought I'd point it out all the same.
Thanks for making this! I'll be sure to share it with my jam collaborators and my friends as well. It deserves to be seen.