Plot: A good setup to have nations and factions without having Earth be an overwhelming influence. Elimination of nuclear and antimatter arms at the start is also a nice touch, rebuilding those specialist infrastructures is going to be a serious ingame task I suspect.
Mechanics: Not entirely understanding how the temporary points work. Wording doesn't click for me and I generally am suspect of heavily stat-based games. Implementation of traits and ability to add twists to how stats are interpreted would be nice.
For my planned nation archetype: coalition of Martian colonies, sitting ontop of a lot of valuable resources and they know it. But lacking in heavy shipbuilding industry, and thus need to be....creative in their defense. I'll adjust as needed depending on how the mechanics go.