Brilliant concept but.....
I'm editing this as the game is undergoing improvements. You will soon be able to choose the sound the tiles make and I like the tone much better. An added dictionary will also greatly improved the game.
Response from developer
Version 2.0 is now available, with multiple improvements addressing most of your concerns. You can now display a word list showing possible words at the end of the game, or ‘hints’ during the game. There are now several choices of sounds, and really bad letter combinations are prevented (although some combinations will still be harder than others, which gives the game more variety). Thank you for your feedback. I hope you enjoy the new version.