Yes, as said already, it's a Space Invaders clone. B/W with color overlays. One thing I noticed about it - I had one at my house for a few months - was that the game play was really slowwwwwww. If your base was hit, it would take about 15 to 20 seconds for the base to explode before it would start a new round.
Good conversation piece, but that's about it. The one I had even had the Japanese yen coin chutes and Japanese writing instructions.
Tom