I feel like grid-based dungeon crawlers are few and far between these days. With the exception of a wide array of Etrian Odyssey games available on the 3DS, it can be a particularly tough itch to scratch.
Fatbot Games' Vaporum, however, is a very well-realized example of the genre. The maps are well designed, enemies are engaging and there's some surprisingly great voice acting for a little indie game. It's an excellent, crisp little package and one that can pull you into its world pretty fast.