Thanks for making a compiled demo!

Just had a look into it! Looks wonderful!

One suggestion, when you place a sky entity like the moon additionally for the sun as well, then the sun's appearence and disappearance would be less suddenly.

The fps is very low. I have heard that limiting the framerate can help. For instance:

fps_max = 30;
fps_lock = on;

I didn't test it myself, yet.