That's a good point, minesweeper automatically flood-fills areas around 0-tiles. I thought about adding that, but what makes this game unique is that you have to physically move through the minefield, so I wanted to emphasize that by making you uncover every tile manually. You can still go around and unlock all the same tiles that would have been revealed by a flood fill, so it doesn't make any tiles inaccessible. However, I suspect that I probably cranked up the difficulty by adding too many mines, so I might add a difficulty setting like minesweeper has.
Thanks for the feedback, I appreciate it!