Minesweeper NES-like

THIS IS A PROTOTYPE, NOT A FULL GAME

Righto, now we've got that out of the way. This is just minesweeper, but with a NES aesthetic. Ideally I'd like it to grow into a roguelike, but as it stands now it's just minesweeper with collectable gems.
To progress to the next stage, you need to successfully flag all the hidden mines. Uncovering a mine will cause it to detonate and you'll lose 1 hit point. Losing all your health results in a game over and everything being reset.


Controls

Arrow Keys = Move
Z = Uncover tile / Confirm
X = Flag/Unflag tile

Music: Aquatic Ambience 8bit remix by Tater-Tot Tunes