Just finished my second 2 player game. Fun factor is easily a 9 for me. In both games so far I flipped Insight to level II to be able to produce 6 ideas. I did this once each game and it really helped mitigate bad dice rolls. If you upgrade research, you can look at 4 cards. These two simple upgrades really give you the agency you need to play the game you want. I absolutely love this game and can't wait to play it many many times. I rate Castles of Burgundy and Trajan as his best, but this might top them both. Time will tell, but it's so good, I wouldn't be surprised to prioritize it every time. I sincerely don't think it's even close to it's BGG weight rating. Maybe a 3.9. My two cents.