By the way, what about adding second Mr. Lift as NPC who automatically upgrades itself? I didn't see any idle games with competitions so it may be a good idea.
http://oi59.tinypic.com/18iqg5.jpg
I think this game needs much more high-quality minerals. Also why gold is sturdier than iron? O.o
And if possible, I request new features that can be opened during gameplay:
1) Auto-trade - all minerals immediately turn into cash.
2) Auto-upgrades, maybe separately for each button.
3) Auto-sliders, desu!
Full list right there.