DoomRL is definitely one of the "best in class" roguelikes out there. The theme is a tribute to old Doom FPS game but the mechanics and actual gameplay are undeniably roguelike. It has great pacing, adjustable challenge level, an interesting item system, and a very nicely done character progression model.
The only point I have against it is that it seems to be closed source. Still, I'm hoping to see the sequel "Jupiter Hell" before too long.
Anyhow congrats on your success, now up the difficulty and try some other character types
Also, the awards system unlocks some challenge games that keep the game interesting and challenging for a long time.