I know of a really old arcade game from before gaming systems like Nintendo were created, it was called Galaga. I know you mentioned a game called "Galaca" but this could be just an altered cheap knock-off version of the famous arcade game. It's like a space game where you have a ship you can only move side to side and shoot 2 missiles at a time to take out an army of alien ships of 3 different kinds. It's an arcade that is usually paired up with another game as a double arcade called "Ms. Pacman". If you've ever heard of the game called "Space Invaders" it's quite similar, only there's no sheilds. Hope this was helpful... I dunno, u asked if anyone knew what this name might mean, and I thought I'd provide some info