Definitely bring back some childhood memories ! I still play the same way, clicking randomly to get started and ended up losing in one click, hahaha !
On a more serious topic, it was really good. I would give the global UI a more enjoyable look. I also think the sound effect is good, but to me the click sound didn't give me the feeling that I was "safe" from a mine. Also some music, and defeat or victory jingle, would have its utility.