There's no way to flag known mines.
There's no indication of how many mines are on a map.
There's no indication of how many mines remain on a map.
There's no shortcut to reveal known safe squares.
There's no first-click protection. That is, you'll have to restart seven or eight times because your starting click will reveal a mine and end the game.
I do like the background, though. It's nicely done. And the forced reliance on memory makes the puzzle interesting.
edit:
Also, when in fullscreen mode, clicks aren't registered correctly at the left and right edges of the grid. That is, if I click near the edge of one square (but still inside the blue square), the game thinks I clicked the next square over. It's still somehow enjoyable, though.