The digging concept is good, but there are some problems with collision detecting.
Like I can only open the door in a certain distance, sometimes I can't pickup the coin even I've touched it, and the enemies would walk through the wall (But their projectiles don't, that's good)
Despite these technical problems, I like this type of game.
Roaming in a dungeon and rooting crates. Especially, it's easy to kill monsters, I like that.
Nice try, I enjoy it!