Ah, I've played that. Desktop Dungeons can be pretty fun, but I think of it as Windows minesweeper/solitaire. It's very bare-bones for a Roguelike, but it's meant to be that way, since people aren't always in the mood for a hardcore Roguelike. Definitely one of the more polished ones, presentationwise, though.
I'd highly recommend checking TOME out; ever since it went 1.0, it's almost like a different game. It's a gen 2.0 Roguelike that evolved from Angband, and spent most of its 10 years of age fading in and out of existence. I think like 2 years ago, it ended up developing its own engine along the way, and now it's almost absolutely nothing like what it was 6 years ago - It's not even in Middle-earth anymore. There's also some pretty good lore and a few really original dungeons (I have a love-hate relationship with the originality of the sandworm one).
Thankfully, it's not one of the claustrophobic "there's just 1 big dungeon" type roguelikes that tend to feel a bit generic to me, since it revolves around a world map, sort of like ADOM before it got bitten by the horrible Kickstarter bug.