I dig this Game (tentative title) development thread

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This here rock piece has a stability level of 2.

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Thus, the marked dirt blocks will fall since their supporting column, resting on said rock piece, has a stability of 2 as well and not 3 like a column that rests on the absolute ground.

Currently, the player can move, get crushed by falling blocks and die from falling two blocks or more. He can dig downwards (Action Key 1) or sidewards into the direction he faces (Action Key 2) (I guess later there will be Action Key 1 using an item and Action Key 2 cycling through the available ones. Or something else, if wished).
Gems get collected when their block gets digged (different gems could have different values on the same counter, but per-gem counters could be done, too). A gem falling onto the player is deadly.