This game is easily the one Ive spent the most time playing on my phone. Its fairly simplistic, yet the itemization and need to use potions and consumables and tactical positioning still require enough strategy to make things tricky, especially following a little twist thrown in once you actually do make it to the bottom level. Furthermore, the inclusion of set pieces and boss fights means that youre never gearing up in the blind: you WILL face them again if you lose.
On top of that, the ability to travel back to the surface at will, to sell or stash things, gives this that extra level of Diablo flavor that so many roguelikes are missing, making gear and food actual commodities, instead of junk to just litter the dungeon floor with.
Overall, Id say Cavern wins out handily over much flashier contenders like Fargoal (which is too Playskool) and even Nethack (too complex and random to be fun on a bus). Ease of play and clarity of focus make this the best roguelike on the App Store.
vrognar about Cavern