The rules are: if any character move to the edge, the screen scrolls, only this one move forward, the others remain inactive until more than one screen away(then auto recycle), and if there is no alive characters in the current screen, automaticly find another alive one in other screens. Sadly I defintely left some bugs which you encountered. And the holes, not a great idea...You have to put three characters in pyramid, and jump until you get out, I may lost 1 or 2 lives in that. Possibly the most satisfying part was the Kenney assets looks so great :D