I'm a bit surprised to see no mention of DoomRL. Yes, that Doom got remade as a top-down, turnbased roguelike. It is significantly faster paced than "The Pit", with very significant leveling 'perks' - you don't upgrade individual skills or stats. You don't have item identification, but you do have a very limited inventory, permadeath, ammo is your 'food' mechanic. You have an actual strafing mechanic (though you're not forced to use it.
DoomRL started out as a 'coffee-break' roguelike, but has seen more depth.
The last couple of releases have been pretty huge. 0.9.9.6 came out February of last year, introduced a 'class' system (marine, scout, technician) with very different skill builds and master traits available (e.g. Marine pistol build uses dual pistols, fires in bursts, while the Scout pistol build gives you a guaranteed sidestep dodge plus other benefits. The varying master traits also tend to lock out some of the lower skills, i.e. marines are often locked out of Hellrunner, while the Technician can (almost?) always unlock the Whizkid trait to do extra weapon modification, special assemblies, and the scout is almost always a fast mover, though there is a chainfire build focused around seeing the enemy and shooting them before they can see you. It also introduced a complete graphical tileset by Derek Yu (he gets around), with full mouse support, and several new bosses. It has always had excellent music.
Version 0.9.9.7 came out on March 19th. It includes new challenges, new special levels, improved level generators, new monster ais, and an online modserver.
