Perhaps you could make it two levels. The top one falls onto the second one and is not fatal, the second one is fatal. You can decide whether to play one level or two. Perhaps even give two ladders to get up from the bottom level, if you can.
Yup, that's what I was thinking.
You could either have it so that the bottom layer would have a damaging but not fatal fall to the floor, but the top layer is higher and thus results in a death... or as Sorontar suggested and have the top floor fall onto the lower floor.
If you'd like help building it, just let us know.