Yup, you are very much right! I'm afraid that block rotating would make it too complex, quite a few people already said they just played it by placing blocks pretty much not considering the letters at all. Of course it was a jam game and some people don't really have the patience to play the games properly and just mess around with em for couple of minutes so that isn't something to really cater the game around though. But having a kind of block "hold" has been suggested and is pretty much exactly what you described too. I think that might be a very nice addition here. I guess I'll have to try these things out.
Thanks for playing and the feedback! ❤️