This has been on my mind for a while now, so I thought I'd tell the world. I propose that new dungeons could be added to the game with the edition of holes/gaps in them.
Here are examples:
Falling down one of these gaps would be lethal. If you start to go off screen but jump back up in time, you would survive. No traps could be placed in the off screen areas.
I feel this would add an element of variety to otherwise plain dungeons that could in the future be added to the game. (Although more platform dungeons would be my first choice).