This is a very cool setting and a very interesting take on the occult. The rules are simple yet detailed-enough to provide a good gameplay.
I can see several easy way to homebrew new contents to adapt this game to every table. Great job providing a cool base game while leaving room for developments.
Special kudos for the random tables. I was surprised (in a good way) by the diversity of the spirits and mission goals. It boosts the replayability!