This is very impressive. A technical marvel in every way.
I only notice that some of the parallax backgrounds are a bit repetitive. The water / sunset background, for example. It almost looks like a singular water or sunset that is repeated twice.
It might be helpful to 'break up' that background with more organic land interaction with the water.
Or just not use that 'two-tone' style too much. [It honestly looks somewhat as if the background is 'tiling' vertically.]
I am not criticizing the game, just offering a little suggestion.
The day-night cycle, integrated into the parallax background, is very nice. For a game that runs on these specs, it is a stunning demonstration of programming elegance.