Just finished an Immortal game as the Celts (vs. the Celts, Russia, Poland, Greece, Sweden, the Iroquois and France), won a space victory around turn 365. Some thoughts:
1. No global cooldown on space parts purchases with freedom helped me win before the first vote for diplomatic victory, where Poland might have won. I really think the global cooldown would help.
2. Apollo program is too cheap compared to other wonders/buildings of the time, especially given the rewards for finishing it first.
3. I still saw instances of an AI building a wonder and not finishing it 20 turns later (this time I nabbed Empire State Building).
4. I still saw a few instances of a siege unit moving next to the city or staying two tiles away without the AI moving a melee unit in front of it for protection.
5. Not sure what the solution could be, but it's possible to block the AI from settling by either blocking the pathway for the escorting unit to move through a small gap in your territory (2 movements for the escort unit, with the settler having 3 in cases of Progress), the AI moving away, you "unblocking" the path, the AI moving back, you blocking again etc. It sometimes seems to be stuck for a while before giving up on settling in a spot it had chosen. Also, the AI is sometimes "risking" by moving only the settler on the tile with the human unit, allowing an easy DoW/capture of settlers. Not sure what could be done about it, but just reporting.
6. My experience has been that if I kill an early settler from the AI, that particular AI will be very slow to build settlers and settle in another direction. Perhaps it's a mistaken impression, but it's like they not just lose that one settler, but "the momentum" for settling, for a period of time.
7. Poland was 10 policies ahead of me and 3 techs (when I just finished artistry), yet I still managed to win by a margin of 8 techs. Not sure what could be done, but it seems like it could have leveraged it better by pushing for Autocracy instead of Freedom and going in for a conquering spree, as it had even a bigger advantage over the others civs. My impression is that the Freedom ideology, besides tourism, allows for others to catch-up tech-wise much quicker than usual, and should be discouraged if the first picker has a big tech/policy advantage over others.
Great version! (My computer is not so good these days, can't save logs)