It looks like I've found the published version of Alien Invasion here where, in the Homebrew section of my site, I have the same game but with no
information and different colours etc It has the same instructions though, so I wonder if the one I found on a random tape (and put in my Homebrew section)
could be a pre-release / development copy! In the listing the date is stated as 1/2/1981 which obviously is before the MZ-700 existed so this may have been
developed for the MZ-80 in the first place. "The ALIENS! have landed and they threaten Earth. Your defence ship moves up and down the screen while you fire at
the aliens. The Aliens have 5 armies. Destroy all five and you save Earth."
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