One feedback bit I have about the tooltips is the icons in each planetary tool tip, like the magnifying glass and the hammer with data details next to each for the planets on the galaxy screen, my first desire as soon as I saw them was to use them as a cascading tooltip, I kept wanting to slide the mouse to get more details on the item mentioned, for example, what is the difference between a dead planet and a barren planet.
Not saying they should expand, just saying my mind just had this feeling I should be able to drill down into those tool tips by hovering longer or perhaps by right clicking the planet to get a more in depth explanation