Here are my suggestions:
1) Add a timer. Put the timer (in seconds) above the score board, and put a button at the front of the game. Have this start the timer and give the player the pinball ability. Here is where the real events happen.
2) Make the game shorter. It's a bit too elongated.
3) More details. It's just a pile of black bricks.
4) Just for effect, instead of using a light to indicate you hit a skull, use the Glow colorfx and use the setexpression event (non default, if that bothers you) to change the skull's expression to surprised when it's hit, and evil when it isn't.
I'm a bit too tired to do events right now, but I could help you out later if no one else helps you.