I was under the impression that Game Dev Story is a simulation game, not a time management one. Are you sure you know what one is?
Yes that is a sim game not a time management game.
Some of my favorites include:
Miriel the Magical Magician
Any of the Dash games Hotel, Diner, Cooking, Wedding, etc
Cake Mania (2 of them but I like the latest better) translate well to the touch screen
Chocolate Frenzy, Pizza -- Frenzy? (same series as the Chocolate one)
My Little Restaurant and My Little Restaurant Christmas Edition (great fun with presents and different twists to unlock)
Farm Frenzy, Farm Frenzy 2, Farm Frenzy Pizza Party
Are You Alright?
Airport Terminal (double staged levels to complete)