Great adventure, as always!
- It's the first time I've seen "2:6" for "2-in-6", really clever! I'll use it in mine too :-)
- I love the movement restriction rule! Although I'm not sure whether a darker hex means that has actually less light. Not sure how to interpret "All light shines only towards the Gravity Well"; does it mean that you only see outer hexes bright when seen from the inner (darker) hexes?
- A tiny usability idea: since the PCs always start in 3.3, that hex could be marked somehow. Or perhaps on every cycle they could restart in a random outer hex.
- The cyclical nature of the adventure is a really cool idea, reminds me a roguelike videogamemechanic, and the variety of scenes in the key hexes is fantastic 👏🏼👏🏼👏🏼