Could you do away with the random generate stairs please? It's annoying, and only works for Harvest Moon because they don't have an energy system, imo.
The only reason I see to having it is to increase the difficulty of getting higher ores, which is kinda already there, due to their drop value; and as an energy sink, thus making players plant more crops, maybe.
Personally, the stairs should be static, imo, and just have the player uncover them, either once, or every time they want to go further. Maybe even have the player buy/build some ladders/stairs, for a money sink.