There are three difficulty levels, Picnic, Standard and Expert. The manual doesn't really state how these three choices differ, and the only in-game descriptions suggests that the only difference has to do with how many times you can restart after dying. However it doesn't go into any details on how this exactly works, specifically does this just mean I get restart per fight, one restart per floor, or something else?
How do the three difficulty levels vary, and how does the restarting after death feature work?