First of all.. We are very happy that you enjoyed the game and that you took the time to comment on it in such detail!
Music/sounds: We wanted to point out the sounds a bit more (Maybe we could add a few)
Cornflakes: Yeah, you are right, they are a bit... nasty. We think about implementing them later in the game or make them a bit smaller. But a bit of nastiness is intended at this point. :)
Thanks for the hint regarding the knocking!
And for the last one.. you got the hang of it. :)