How I Use It
I think this is only useful as a way to keep kids busy and reinforce letter/word recognition at the same time.The creativity his highly limited and the "insert the word" sentences don't really seem to make sense.
This is just a reinforcing side activity. It's not anything I think would be particularly useful for teaching. Kids put stickers in their corresponding shapes and hear the words repeated via audio, which is good reinforcement. But they aren't really creating anything, just putting words into sentences whose sense is debatable.