There's also the matter of future developers to consider. I'm in the process of looking at game engines to learn, and Unity has decisively crossed itself off the list. Even if current studios and developers stick with Unity, startups and novices would be foolish to pick a game engine that might suddenly decide to charge them out the ass with little to no notice. Existing developers have the issue where they already have tools and experience with Unity, but newer folks don't.
Cultist Simulator is pretty unique... not necessarily in a good way. It's a storytelling/puzzle game with some great writing if you can power your way through the gameplay. The mechanics are deliberately very obtuse, with no tutorial, to emulate the fact that diving into the occult is confusing and dangerous. The end result is that the game is very unique and cool, but it's absolutely not for everyone. TL;DR on the basic mechanics: you have a handful of verb boxes, such as Talk or Research, as well as various cards that you can slot into them. Each card has a variety of tags on it. Depending on which cards with which tags you put into the various verb boxes, you get different results.
I don't know for sure, but I think it's just a couple missions before the end. You have a choice to either fight Cinder Carla (siding with Ayre) or to fight the corps (siding with Carla). I sided with Carla, which made Ayre the final boss, and the fight was godawful. My understanding is that there are maybe more endings with NG+, but I'm trying to muster up the will to bother even turning the game on again after how atrocious the Ayre fight was.
Honestly, Armored Core VI. Endgame spoilers below (idk if there's a way to do spoiler tags?).
The final boss is absolutely godawful. Just utter garbage. It took me hours, and I hated it from my first attempt. It's categorically different from anything else in the game, and there's never a point where it's fun. Probably 20% of my total playtime was on this one boss. I was absolutely loving the game up until then, but that one boss is so unbelievably poorly designed that it ruined the entire game for me. It's genuinely impressively horrible.