I played for about 10 minutes but I got stuck :c I had no idea how to use the "?" signs after trying almost every key on my keyboard as well as clicking on them. There was no indication to me if I had selected the mining helmet or the pickaxe either. Am I missing something?
Other than that, I think the graphics and music are pretty good. The story setup sounds interesting, just wish I knew how to continue. If you can shed some light on that, I'll try again!