
According to AbyssDragon, Lost Dragon (DeBray Bailey) was one of the first people to use DCGames, and his game DBQuest is legend. In any case it is the only finished game made with this construction kit that I ever found mentioned.
Note that this game was made with DCGames 3.0, which supported only VGA. A planned DBQuest 2 would have run in SVGA, but seems never to have been finished.
This is version 1.2B from 1995, an unaltered re-release of 1.2 (February 1994), which was a graphic overhaul of the original game.