ABC learning Game

Hi I need an app developed for teaching the English ABC’s to native German speaking people I would like to be the one speaking in the app, there is a square box 4 rows wide and 4 rows heigh, the abc’s drop and fall through the box at various speeds. There is an A on the right side of the box which has the ABCs falling through it At the start of the game I tell the player in to tap on The A as it moves through the box, as soon as they do that then it’s the B and so on to Z And then it speeds up, you do this over and over till you know the ABCs real good I can draw pictures if that will help The app will need to be made so that there are different levels, once you get the ABCs learned it will start dropping short words through the box,