Key4english işler

I want to develop interactive games targeted at young children (from 3 to 12 years old) to place in an english materials shop. -the objetive is to teach english as a second language. We are talking about simple games, with only one player. The palyer have to follow the instruction given by the game - written and oral, in order to succesfully finish the game. We don't have a big budget, as we are a starting project. We are talking about 10 games to start with. Thanks