A small new feature for the upcoming free update of CopperCube will be support for dynamic day-night cycles:
There will be a new open source / extensible behavior written in JavaScript for doing this, as well as an improved scripting API making this possible if you want to do this yourself. The existing implementation has been copied from my
PostCollapse game, but it should be able to customize it easily.
I think this will open the possibility to create a lot more interesting games.