Forgotten Tales

That would be awesome if you add night time in game ,at the first you may just make object's in game dark and put some light's , but later you can add Monster that only come out at night and new quest must be done at night ,shop's open in certain time and many new situations...

Serious code rewriting there, especially for dark and lit areas, and moveable light sources (lantern/torch/wand/staff).

The games I have played that did it have done it from the outset, because it's a significant change.