A decent story, it was a fun little excursion. What I think would have really elevated your story would be being more descriptive. You left a lot of blank space that could have been filled with more descriptions to help us feel like we were down there with the dwarves. The middle of your story was the strongest when you did that, but unfortunately I felt the beginning and end just lacked that extra sauce. Also I would have had more consequences for the early explosion. It felt the plan still went off they just had a minor set back. I would have really liked to see them have to improvise due to a larger consequence. Over good, I enjoyed it