I've been playing Dungeon Crawl Stone Soup. It's a port from a PC version so the controls are a little clunky, but I find it a nice change of pace from SPD.
There's a lot more complexity in the game and at least one tutorial says to focus on minotaur berserker to simply learning the game.
It's a seriously complicated UI but once you get used to it it's pretty fun. The use of the default non-android keyboard will take a while to learn all of the key board shortcuts.
Also note that you don't actually need to manually use arrow keys at all. You can use 'o' to auto search the map and Tab to auto advance to / attack enemies. You can also zoom in a bit with volume keys to make the map a little more visible