[@LegionPothIX] [url=https://www.youtube.com/watch?v=9MEbzIUbkFk] Youtube link to a gameplay video showcasing the Goo race [/url]

They are basically nanotech "creatures" designed by humans to scout the unknown parts of the galaxy, find life on other planets, record their existence and then send back the information to Earth (or space base etc) but as the nanotech grew in number they became sentient.