First of all, nice game. I really enjoyed it, amazing looks. I beated it first try. Now onto the feedback:
-Moving the board around with the right click can be annoying if you try to do fast gameplay, this gave me some cases where I was trying to flag a mine but ended moving the board. I don't know how I would solve something like that, maybe try changing it to the left click and see if thats a good implementation or not.
-A minesweeper rule is that the first click is never a mine and in this game that rule doesn't apply. I don't know if you changed it or you didn't know. This could be changed easily in any way you think is convinient.