I really like the idea. But it still mostly feels like it still just comes down to random chance regularly. Even if you play perfect minesweeper and don't hit any mines and get many of the time and click bonuses, you still come to the point of "did you collect enough hearts to tank the coin flip situations".
The boss effect with the empty cells also just adds way more of those coin flip situations where you can't "solve" the mine and just have to guess, due to having less information available.