I've tried it briefly, yes.  It was a good concept, but lacked in a few areas - the controls were awkward, the maps were disjointed, and the objectives weren't really clear.  Granted, this was a few years back, so it may have matured some since then.

You might also want to check out Aaron Bishop's later project, SoulFu, if you're just looking for a fun dungeon crawler to play.  Difficult as hell, but more polish to it - better class system, more continuous maps, and far better controls.  Not sure if it has a native Linux version, but I had no issues running it in Wine.