I have passed the first tiredness barrier (the next one should come up in 4-5 hours) and as such I am working at 2x speed. That, or everything is just going by very slowly.
I've added a new type of mine-able tile called the Jewel tile. It gives you much more gold than normal gold tiles. Also, all mobs now have fancy HP bars so you know when you're about to die. HP recharges if the mob isn't in combat.