overall, a very nice mining game, the music was upbeat enough not to put you to sleep, but calming enough to make it nice to listen to. graphics, while they did there job well, could definetely have been better. storyline, or what was there anyway, did make for a nice side quest of getting to the bottom, even if I was a bit saddened you didn't really make use of the quest system to look for minerals your already past... or that they didn't give you anything special other then cash... so far as I could tell, I could get the last thing as soon as I got the shop opened and completely ignored the quests almost completely. also, with all of the instructions you have to wade through, it would've been nice to have that 'c' was cancel as well, had to look at your instructions below to figure that out in the shop...
overall, while the game is very well put together, it could have used a bit more in the ways of having the quest system more expansive and more necessary, adding in actual hazards so you have to actually watch out for stuff, something to use money on at the end of the game (was sitting at 100k+ after 3 trips to bottom with nothing to spend it on) and updating graphics a bit, and flesh out the story a bit more, you would have a real winner here.
however, for the people that want a nice calming mining game to waste an hour or 2 on that they don't have to think about much... this fits the bill very nicely.