Wow, this is stupidly fun. Excellent job. I love finding jam games that are THIS simple because you can put some much time and polish into them and your players can have a blast. There's enough variation in the word placement to keep you on your toes. The constant four letter words are great. The timing is just enough pressure to keep you going without feeling unfair. Excellent.
You did great on this. Be proud! Keep making awesome games!