I don't understand the correlation between "I'm going back to school and I'll have a lot of work to do" and "I'm going to take down this thing I made that people want to play". That doesn't make any sense. You can move on to something original while still keeping this up. Unless there is something you aren't telling us, like the threat of being sued by the original creators of PT or something.
This game won't demand any more of your time. If there are bugs, there are bugs. Even the greatest of games has them. You don't have to fix them if you don't want to. You can just leave the game up.