I've played/own for my phone: Riptide GP2, Flick Golf, Hitman GO, and Threes! from this list. I can easily recommend all of those.
I've heard good things (though haven't tried myself) about or I've played on other platforms: XCOM, Leo's Fortune, Shadowrun Returns, GTA: Chinatown Wars, Terraria, Machinarium
I think I'm probably going to pick up Leo's Fortune from this sale.