Habitable Planets Should Exist in the next update as it would add to the exploration and be more enticing to find one.
They should only appear if they have earth-like conditions and are in safe pressure and temperature zone
u should also make it that its not guaranteed to find a earth-like planet based on the above more like a 50/50 (its on you) and that the earth-like planet is either fully vegetated, half vegetated, or very little vegetation (kinda like if it was starting to grow vegetation on the planet or it was already finished)
Kinda of a side thing would be cool to see is city lights on a very rare occasion when zooming into or shift-clicking on a planet to see people living there it would make the game more "alive" because were the only one zooming around in 4 ships blowing up green, red, blue blobs
(oh and before i end this off when u shift-click it should open a little "interplanetary system" in which you can find moons and whatever you can think, also adding moons would add a bit more to gas giants as there entire purpose is just existing to be gold mined :'( if u want some crazy ideas about moons or something i can talk about it)