Dino cards with timeline

I recently started building a dinosaur app for my children who wanted to know what his dad did for a living (I'm a web developer).
From random visual and UX experimentation I quickly steered towards a dinosaur gallery with associated games. The first game is a memory game.
App is in closed alpha.
Silhouette credit: http://www.freepik.com/free-icon/dinosaur-shape-of-spinosaurus_717688.htm