i'm a big fan of the new mining dynamic.
with each gem you find, the chance of you finding another gem decreases.
this resets each game-day [4 hours]
i think this is terrific, and works well to punish people for wasting 45 minutes or more continuously mining, and encourages you to leave the mines to do something else.
basically, it is a brake on grinding to discourage grinding and compulsive gem hunting. i love it.
the glitch skill system is great, because if you leave the game for whatever reason, you always know you're still making progress. it is the game's way of saying "leaving? that's ok. i'll be here when you come back". mining feels similar to me now. when i leave the game i don't feel as if i'm missing out or leaving currants on the table, coz if i kept mining it'd be diminishing returns anyway. i know that the game day will reset, so i am encouraged to leave and come back later to find myself back at full energy.