contractions look fun but aren't

I liked this memory contractions game. Unlike other memory games, matches aren't exact matches but similar ones. For example, "do not" matches "don't." The matches (which may not be intuitive for a second grader) once made appear at a small screen just below the main image or match board.

My second grader, who I think understands the basic concept of contractions and knows what a matching game is, didn't like this game. The non-visual nature of the game is a bit confusing as most matching games involve matching exact pictures.