It's pretty good, but there is one thing I would like to see in this game. It seems all stages have only 2 words, making it a bit repetetive after a while. I think it would be a lot better if later stages had more words in them (3, 4 or even 5 words?).
Another small thing is the fact that an entire word can be filled out during generation. It would be better if there is a maximum percentage of each word that can be filled out during generation.
Some music would also be nice.
Overall it is a fun and relaxing game which I might revisit every now and then.