Forgot to respond to your question:
I released Four Little Words a few months ago and I was trying to think of new puzzle types that fit the concept of fours to go along with the initial puzzle type that was released with the game. I thought of games like those you used to find in the newspaper where you change a letter to make the next word in the list and it led me to this block idea with a 4x4 grid (hence the four connection). It's definitely more of a challenge than the daily theme puzzle of Four Little Words, but it has a lot of growth potential on replayability.