Failed at the 246 level-
This was really cool. You managed to make every interaction feel good on just a feedback level - some nice visuals and sounds went a long way to making placing tiles feel good!
You probably thought of the idea already but what if you could see what tiles were next in your queue? and/or you could hold a tile for use later? Like in Tetris? Not sure if that's the kind of game/balance you're looking for but I feel like that would be useful for learning.
I think there's potential for strategy and expanding on this idea, and it makes me sad that this submission will likely get glossed over for lack of cats but I hope you explore this idea further, all the best :)