These are all iTunes links. Most of these are also available for Android and other systems, but I'm too lazy right now to look up the links.
Angry Birds Epic
Happy Hills 2: Bombs Away!
John Woo's BloodStroke
Sara's Cooking Class
Sara's Cooking Class: Vacation
Towers & Dungeons
Word Wonders: The Tower of Babel
Warstory: Europe in Flames
Aktiv mit MS - kognitives Training
Skylancer: Battle for Horizon (offline)
Mission: Genesis (offline)
I'm totally addicted to Angry Birds Epic right now, so I'd absolutely recommend that you at least check that one out - even if you're not a fan of the previous Angry Birds games. I think the Happy Hills games, Bloodstroke, Word Wonders, and Towers & Dungeons are also well worth looking at if you like casual games.