I do like Dandy Dungeon a lot! I played it tons about a year ago. I'd say my favorite quick-play dungeon crawl game is probably 1bitrogue on mobile by kan.kikuchi. I also LOVED int98f by Dogmabooks (Tetsu Kayama), but it was only ever for iOS and I don't think it's even playable on newer versions...it's a shame, it was a brilliant and great-looking game about being a rat exploring a tower full of bizarre cat monsters.