Excellent layout and style. All the rooms/map locations feel well-fleshed out as well. I always dig a fantasy story that takes the characters to space! My only suggestion is that with such a unique setting I bet you could make the encounters on the Tower Random Encounter table even more steeped in the narrative and give us juicier tidbits of what life is like at the Astral Tower. Are there any unearthly creatures that dwell that we wouldn't find on our home planet? Overall, a really enjoyable read!