Curious on suggustions on my new game im making ?

I am making a game like space invaders

(
when you have aliens, and you have to shoot them before they shoot you , its 2d
)

and, i have the REAL Basis of the game done.
(BTW , there is sound when you shoot the gun, but my volume was off)
Before posting please read whats going to be added
~You lose health if you get shot
~Different images

I got a suggestion, that every time the enemy's get to one side ( like they hit the right wall ,or left wall) They get smaller making them harder to hit, so please give me suggestions + comment on my new c++ game :)


http://www.youtube.com/watch?v=9GzqhLmsj5o

Edit: its not that laggy either :)

I don't have a suggestion, but it looks nice(concept).

Thank you, and by the way, if any body wants some of the source, just hit me on msn

air_mc_roberts@hotmail.com