Making good use of the "CancelEvents" (EG: hitting the door button cancels the event where you would die.) But getting this to be not abusable, and implementing a working power system are both increadibly hard to do with the default events.
Making a clock sounds easy enough, but making it work like hours instead of going through a cycle of 1-9 is also hard, IMO.
tl;dr: Good luck getting the events to work, if you do, this could be rediculously fun.