What an awesome game! Really addictive, I stayed up all night playing until I won. Excellent use of the Oryx assets too, I love the little interactions different monsters have, like the giants getting heart broken and the minotaur getting surprised when you steal their gold.
I will suggest mentioning somewhere that you can right-click to add flags to cells like in Minesweeper. I only realised it because I play regular Minesweeper myself and know how important those are.