Help me remember: Atari 2600 Game

[Vampyr]

There was this game I used to play on the Atari 2600 as a kid, but I cannot remember the name of it.

The only thing I really remember about the gameplay is that it was a "slide" based game, where your character slid back and forth on the bottom of the screen. Occasionally a beam would shoot down, and if you got right under the beam you would slowly "beam up" through it.