Hi.
Just came across a roguelike made by Tprojects (Telchar) using GameMaker.
It's quite simple yet very funny to play and in my opinion well balanced.
I usually never get hooked while playing more advanced roguelikes...but with "Trapdoor Below"....well, I got really hooked.
Try it out, there's a new version out (v. 1.20.2).
Link goes the the authors thread over at a GameMaker-forum...download in the first post:
http://gmc.yoyogames.com/index.php?showtopic=442346