Space and stuff is great, I love it. But I would love to see underwater exploration (maybe even dedicate a planet covered with water). Players need special vehicles/suits to be able to go deep in the ocean. Explorer ancient sunken (space) ships, hunt rare creatures or mine special minerals could be some reasons to do so. Could become an game expansion, an early update or even implement straight into the game.. I think this will add up content towards the game, and work of course.