It took me many tries, but I finally won a game! I like the challenge of playing a game that I'm not always going to win. Like others have said, it took a bit of getting used to at first, and after some thought I have two suggestions:
#1 There was nothing in the rules or tutorial telling me that I could move stones that I had placed on the board after they had already made words. I found out by accident and it took me a bit of trial and error to figure out how it works. Maybe something showing which stones are fixed in place from the start and which ones you've placed yourself? And something about it in the tutorial or rules?
#2 It would be great if you could reorder the stones you have to work with at the bottom of the game. It would make figuring out longer words a bit easier and also help me keep track of the letters that I'm saving for a bigger word.