With the affinities units upgrades being so random and new ideas are needed I suggest removing the upgrade system and add a fourth affinity. They increase their bonus with each level of affinity earned with the first one adding to attack, second defence melee, third defence ranged and the fourth is healing. Also adding national wonders or two for each affinity such as movement, masima bonus, city attack and defence, sight, cost production and energy and maintaince, and promotions. There are a lot of nice units except they tend to overlap usage and are monotonus. For the love of drone command and alert workers should be national wonders and more artifact rewards please. As of the culture tree some of the ideas are fruitful and others are wasted, needs more alien rewards along with diplomatic capitol kills should be 50 not 5. At last sattelites tweaking by making them tougher in combat and area of effect could shrink and get stronger with age. 4 bits 2 cents 0 rules.