I've been playing a marathon game this weekend and have come up against a middling annoyance that I encounter in many games. But I never really thought to say anything about it before.
The construction options on a planet are a real hassle to navigate through!!
And the solution is very simple. You need to add a couple collapsible menus to the planetary build screen much like you have in the Starbase build screen. You should have sections for different building types like "economic", "cultural", "manufacturing", "wonders", "military", "artifacts" and so on. It would be a very simple tweak that would make the menu a lot less bothersome to navigate as my empire starts spanning dozens of planets. Please consider it!
Thanks as always for the fun game.