Delteria's night and day system doesn't even show in fb, so I wouldn't worry if it's too dark. A day/night system would be great, perhaps there could be an option to turn off the graphics for day/night system. For example it's too dark for you, you can turn on the option to prevent that, but the effects of it being night are still there. Kind of hard to explain, but basically it is still night in game, but your device doesn't show the dark. Everyone would have the same time, so if it's morning for me, it is for others as well. Perhaps at night, more wild animals come out to hunt. This could also introduce night bugs like fireflies, if fishing is implemented it could also have certain animals only coming out at night. This would be really neat, perhaps some shops will even close and bars and diners open at night? The day/night system shouldn't be too long so players wouldn't complain, but it shouldn't be short either. You can even expand on this and add secret cave openings/places that open during a certain time like 12:00-13:00. This would be really neat. There could be a town clock to display exactly what time it is as well as.