Far better than the dismal Cosmiads and just acceptable as Galaxians - though the animation is rather jerky. Red, purple and blue fighters and two yellow motherships peel off from the formation to provide a contest; the tail end survivors are especially difficult to mop up. Action and sonics both pass muster, but I'm afraid the C64 versions of this arcade classic have spoilt me.
Stiil, until another software house is able to prove otherwise, this would seem to be the one to have on a Vic. Serious space battles should investigate further.