Yeah, I am pretty sure that is it. A little different than I thought (the ridges were on the side and more irregular), but I was pretty close I guess.
I am very impressed, did you recognize from the description/render, or did you research and find it?
Thanks a lot for the help by the way, now to find one in good shape to add to my collection...
That render gave me the impression it was early/mid 80's by design and the screen you mentioned sounded like a VFD, most games from that period used large batteries and had screens like that. Late 80's/90's were more streamlined using AA batteries and LCD screens. Also many people confuse Galaxian/Galaga but there aren't a whole lot of mainstream handhelds based on those two games either way.
I've used that site often and it's by far the best resource for handheld electronic games I've seen on the 'net. Glad I could help.