There is a strategy, but I found it ridiculously easy to pick up. At first I was just guessing randomly and sometimes including double-letter words etc. Now I consistently get it in 3-4 guesses but my actual score seems to depend on luck. It feels like I've solved the puzzle and now just going through the motions doing it again and again. A bit like speed solving a Rubik's cube once you've figured out an algorithm maybe.