I was taken aback by how polished that cutscene in the beginning looked! Nicely done. :)
Admittedly I feel this game is kind of rough as is. The movement is a bit sluggish and the mechanics are lackluster. Also some pitfalls kill you while others take you to new areas; I would recommend distinguishing between the two so that the player doesn't dive first into pits thinking there are secrets to be found.
Despite this, I still think this is a solid foundation that can be built upon! I would love to see more ways you can unleash chaos in this mine (maybe drilling through walls, dyamite, etc) while avoiding its dangers. It's got potential to be a fun action game if you were to continue with it, and I'd love to see where you take it from here!