Train Game - Concept v1.0

My 2 year old son loves trains. I wanted to try making a quick train game that focuses on learning shapes and colors. Currently in v1.0 the player is presented with a collection order (get certain colored shapes in a particular order). So most of the time I'm asking him "do you see a green square?" My son will repeat "green square" and touch a visible green square on the iPad. It works.