When I switch to another tab in the same window as this game and then return, the animation of the sun/moon is out of sync with the game's actual day/night cycle. I suspect this is because when the tab containing the game is not the active tab within the window, the game logic "runs" while the animation does not. It does go back to normal when a new day starts and the phase can still be determined by which resource is currently being produced, but it's still noticeable.
I'm not really expecting a fix for the next two weeks since from what I remember updates are forbidden during the voting period according to jam rules, but the game receiving one after that period would be nice.