A simple shoot 'em up I wrote a long time ago. The premise was to write a game simple enough as to be absolutely sure of finishing it. Here it is, so the scope was spot on :)
The was some perverse pleasure involved in abusing JS + JQuery, HTML and CSS while doing this. That was part of the reason behind the decision. In a more humble light, I would probably have failed to finish it, had I chosen any other tech.