Space Bugger?
Warp & Warp?
Thanks ! Its neither of these games. The game I mean has better graphics than the two games you mentioned. Its aliens are made up out of a couple colours. More like the aliens in Galaga/Galaxians. Also the game I mean is a Table Model with glass surface with on opposing ends the controls for the players and on these same sides their spaceships moving left/right (and possibly up and down) shooting bombs into the middle field of circling aliens. I took a screenshot of Galaga and edited it so it looks like the game I am looking for :