This game made me want to get good at Minesweeper, and the music slaps harder than is has any right to. (Steam version when?)
I do have a few suggestions though. First, when playing the game on a laptop, right clicking can feel a bit clunky and unreliable for a game like this, so I would suggest including an option to set any key to place flags instead of having to right click. I know there's an option to hold the mouse down to place a flag instead, but that only wastes time when you're trying to be quick and you often end up placing flags when you don't want to that way too.
Second, I would make the option to enable master mode a little more obvious and easy to find. I wasn't aware that this option even existed until I decided to click the face in the top-left corner of the menu out of curiosity. To me, it just doesn't feel right to play Minesweeper (outside of adventure mode, maybe) with extra chances.
Also, just throwing another idea out there: Minesweeper Rougelike. ✋ 🤚