Very creative approach to minesweeper, love the minimalistic approach to the visuals and fits Ina's personality really well. Like most have already pointed out, it needs a reliable way to move diagonally, since it is a pretty important part of the game. One way I can maybe think of is to have a little tiny delay before the player starts moving so players have enough time to register 2 directional keys.
I've enjoyed my time with it, thanks for making this!