From developer's website:
Fight your way through a fantasy dungeon in 10 minutes or less
Classic roguelike play re-imagined as a single-screen puzzle game
Unlock loads of classes, races and challenge dungeons for awesome replayability
Online leaderboard allows you to compare yourself against other players
Deep, challenging, randomly-generated gameplay
Desktop Dungeons offers an unquestionably unique approach to roguelike games by taking compactness to the extreme. It distills the entire genre to a few core ideas which pay homage to the greats while forging new ground with gameplay similar to that of Oasis or Tower of the Sorcerer. It also features emergent complexity that rewards truly skilled and thoughtful players.
With an extensive character unlock system and an average play length of about ten minutes, Desktop Dungeons is a great coffee-break game for just about any player.