I loved the concept of this game so much!
The thought of the sweets tray and all of them coming down is so smart and with the music board implementation makes it all the better. I found myself struggling with the keys at first, but soon enough I got the hang of it. My number one recommendation would be to rise this line. A little more towards the middle of the page and add a bigger spacing between them. This is because once the player is in the middle of the game, that area tends to become compact and busy making it harder for the player to enjoy the game.
The game is very memorable and fun.