Just attempted to play the game today!
I'd just noticed that I was unable to get past the tutorial, as the white button did not seem to be doing anything, regardless of which dots or dashes were being transmitted, or the duration of the mouse press. I'm not sure why this is occurring, as it seems that many other people have been able to play this game. (Context: I am using Wine to run the game on Linux)
However, the concept of the game seems really cool, and I would really like to see what else it has in store, if only I could pass the tutorial. In the way of suggestions, perhaps provide a different method for delivering the beeps (selectable in some sort of options menu, or at the start of the game), such as the 'space' or 'enter' keys. That's really about it for the feedback, I really can't say any more about it; seems fun, but unable to play.