Based on the early impressions in our forums and my own brief time with the game, Quest of Dungeons is pretty much what I expected it to be, a straightforward dungeon crawler. It's not heavy on features or any massive changes to the roguelike formula, but it's a ton of fun. There's four different characters to play with, plenty of loot to find, and lots of dungeon space to explore. I also really love how quick the character movement is, as sometimes these types of games can be a bit too slow for my taste.
If you're interested in a new dungeon crawler, for a couple of bucks Quest of Dungeons should fit that bill nicely for you.