Alrighty guys this is such a cool idea!
We should get together and make something like, the player is completely customizable, and the day/night system is read by the time of your computer. Anyway, using DropBox for patching files, you can make special events that happen on certian dates, and special items and everything! Prettymuch making for an infinity growing 2D world. The player will be able to customize his/her player fully with billions of hair styles, clothing, weapons, and everything!
I got this idea while watching .hack// lol