For the last time (lie, probably), Endless Space.
Race: Amoeba. Highly intelligent, treacherous-as-hell oceanic life forms. Totally likely to make you accept diplomacy, by the means of a siege fleet pointed towards your home planet. They keep reminding me of the Hanars, except (way) less annoying and more “i’m totally going to annihilate you if you don’t give me those damn minerals”.