Hi all,
I'm hoping someone here can help me with this one as all of my searches have come up empty.

It is an action/puzzle game, most likely for the 2600.
Your character moves only up and down in the center of the screen.
Colored bars grow from the left and right sides of the screen towards the center of the screen, and you shoot them or otherwise stop them somehow.
The game ends when the bars reach the middle of the screen.

Thanks!