This is a stupid, pointless game, and I can't stop playing it. Seriously.
I clicked on this game thinking it would be just a boring little game that I could use to kill time waiting for a download to finish. That was more than 12 hours ago and I'm still playing. It's seriously addicting. There's an actual challenge of sorts, and actual resource management is required or else you'll end up screwed six ways to Sunday. The art is simplistic, which doesn't really matter in this case because you'll be too focused mining to care. Sure, the gameplay consists of nothing more than "click the same rocks for a few minutes, then turn the rocks/ore into stuff so you can mine more stuff", but that's what makes it addicting.
Granted, I do have some problems with the game, mainly two: The inability to mute the sound effects (as the same stock noise of balloon popping/rock breaking/bell ringing/etc. get real grating after a few minutes), and the health potions. The fact that the health potions increase in price the more upgrades you get from the blacksmith is SUPREME bullshit, and since you can't increase your maximum health in any way or how much health each potion heals, it means that you'll very quickly be paying thousands of gold coins to restore 30 HP. And since the only other way to restore health is with one of the runes (which is mostly luck-based considering how low of a chance the ores connected to the rune drop) it's really infuriating. Aside from a few other nitpicks, these are really the two major complaints I have.
All things said, it's a surprisingly addictive little game. It could be better, definitely, but as it is it's pretty damn great.