This is a neat little game. Really like that you took the idea of a 'loop' in a different direction than most of the entries seem to. I do wish the rope wasn't so stretchy though, it made it really hard to swing the pick axe in an actually satisfying arc and instead I just found myself trying to flip it in straight lines.
Camera controls were a little wonky too, I kept wishing I could move the camera around with ASDW because clicking to drag when the pick axe is also attached to your mouse means you cant really be trying to mine and move the camera at the same time.
Over all I quite liked this one though! (do any of the ores besides the crystals do anything at all? If so I couldn't tell.)