Found it quite difficult but I'm not a big fan of this type of game.
What if the game mechanics were changed to more of a dungeon crawler so the players character or team enter the dungeon and fight their way through with the minesweeper fog of war system as a way for the player to ensure they navigate the dungeon the best way.
Then factors like moving monsters could be part of the game mechanic and make for a way more interesting experience at least for players like me.