This is a pretty fun twist on the classic Minesweeper. The new hinting element and a new question mark tile balance each other out quite nicely.
Also, very nice art. The selection of the music fits the theme of the game well.
Adding a free mode after finishing the game would be nice. After finishing the game I was going to try the last level once more, but pressing retry reset my progress T^T. (or maybe there's a free mode but I accidentally pressed "retry"?)
Anyway, nicely done!