I've been playing Cataclysm DDA on Android for last two years. It's clunky and awkward, but for me it's still the best game on platform. It's the only mobile game that managed to keep me hooked for months.

One thing that's even better than the desktop version is the amount of immersion. You play out this character's life in post-apocalyptic world. You get to make choices for him: what items to collect and leave, what to craft and cook, what to eat and drink to get necessary vitamins & minerals, how to dresses for each season, how to recover from injuries and sticky situations, how to maintain and upgrade a vehicle, how to learn skills necessary to survive... and it's a turn-based simulation. When you are interrupted by RL, you just put the app to background and forget about it for hours or days. Then you start the game again and your character is still where he was, waiting for your choice on what to do next. It's incredible to be able to have something like this in your pocket. A simplistic but still immersive simulation of reality where you can lead a second life.

As a bonus you get to pick up basic knowledge on wide range of topics, from item descriptions and craft recipes - chemistry, medicine, farming, ancient and modern weaponry, car mechanics, survival in the wild...

One word of advice - turn off all enemies when you are starting out, and focus on interacting with the game and its rich world.