Great idea to mix Minesweeper with digging/exploration. Haven't seen that before, and it turns out that it works well! It does seem that digging any "1" tile leads to death though, which is unfortunate. I would have liked to see some more use of the actual Minesweeper mechanic - i.e. make it so that digging a tile adjacent to a monster doesn't kill you, but digging the monster does. And have more monsters. You'd then actually have to use Minesweeper logic to get the best score, which would have been neat. I'm not so sure that the ability to kill monsters would have been the right direction, as it would dilute the Minesweeper feel and turn it into more of an action game, which is less unique and IMO less interesting.
Excellent use of audio, graphics were quite decent. Use of theme was not so strong, unfortunately. Also it would have been great if you'd had time for procedural levels - I was kind of expecting them and was a little surprised when there was only one, pre-made level. Still, neat entry, good job!