Nice, happy-feeling game! The sombre music on the gameover screen was good. Adding the player's score to the gameover screen would be beneficial as I had a few good runs and then had no idea how close I got when it went straight to the gameover screen!
Also, see if you can make the Play Again button selected by default so the play doesn't have to take their fingers off the keys they're already hovering over. Make getting back in for "one more try" as quick and easy as possible.