HP graphing calculators have a game like this called Minehunt. I always played for a perfect score by finding all the spots without mines anyway.
It might be good to add a way to move diagonally.
That's interesting, I hadn't heard of Minehunt before.
I agree, moving diagonally is definitely a major issue. Right now you can press two directions at once, but it's really finicky, so you may have to place orange flags to prevent accidentally moving laterally and try it that way.
One solution I am considering is adding WASD control, and using Q,E,Z, and X for diagonal directions. I might also add an input delay so you can press two keys at nearly the same time and it will still register as diagonal, I'm just worried that will feel unresponsive. I've got some testing to do. Thanks for the feedback!