I thought we're talking about Flash here? You know, the thing that only works on a subset of browsers on the three major desktop OSes and has absolutely zero modern mobile support.
Almost everything that has been done with Flash falls in to one of two categories:
2. Things that should be done with a proper game engine.
There's a very small margin in between those two mostly full of games too complicated to be practical in HTML+JS but too simple to really be worth the effort of a full game engine. Even that range is getting a lot smaller these days with the number of high quality game engines available for free to anyone who wants them.