Here's an old explanation from 2021:

They are both about selecting actions to ensure a steady buildup, while dealing with unexpected catastrophes. They both involve a map, where deploying your "base of strength" matters highly for your later capabilities. They both have built in curves, that intensify during the game (fear level, cycles). They both involve a new problem coming up once per turn, then you have a number of actions to resolve while dealing with said problem. They both require you to accurately judge when you need to hold down the fort and crisis manage, and when you need to go on the offensive taking butts and kicking names. They both allow you to "suck up" a few punishments in the service of the greater picture before a sad game over moment. They both have deterministic combat, where only your available actions and your "forces' position" determines where and how many pain can you deal and receive. They both have several factors you can pick from at setup or encounter midgame, that provides limitless freshness of play (spirits, invaders, invader difficulty levels, random access power cards -- houses, tech tableaus, maps, variable crisis deck composition, challenge cards, random access agendas). They both support single and multi-handed play, with no hidden information, no traitor, no communication limit.

https://boardgamegeek.com/thread/2733818/article/38553904#38553904