My game is copying the basic gameplay idea. a paddle bouncing a ball which destroys blocks on the screen. I plan to enhance the game in the following ways.

1. exploding blocks with animation.
2. blocks on all 4 sides of the game play area.
3. blocks that move side to side once most of the blocks on a level are destroyed, something like less than 10.
4. new powerups such as enlarged ball, chain reaction explosions, etc.

These are some of the enhancements I am working on while creating my own working version of Breakout.

Another question I have is this. (I posted this in game programming but got no responses)
1. I am making a GUI for my game and I am not sure the best method to use. Whether Win 32 api using callback functions or my own event driven screens with only one winproc.
2. Whether I should use an existing library such as CEGUI.
3. if a button really is just two or three statics that change the bitmap based on the user clicking on the control.

Any feedback is apprectiated.

Thanks