While I pumped many hours into Cataclysm: Dark Days Ahead ( !dda_discussion@cdda.social ), I'm not sure if I would recommend CDDA on small screens like a 5-7 inch phone, but I have not played CDDA on a tablet yet.

They solved the controls problem by having a row of applicable keys at any given time as overlay, but especially navigating through the tile-based map isn't the easiest thing.

If you've never played CDDA before on any screen, you might need to look things up occasionally, as it has a steep learning curve. Beginning as a strong, defendable person in an evac shelter, that acts with caution around zombies and other cataclysmic critters, makes things less intimidating or frustrating.