Seeing as Rastan is a hack-'em-up, this looks like the ideal opportunity to crack lots of "Are you dying for a slash?" and "Time to get your chopper out" jokes. Er... (Don't you dare. Ed) Oh. Perhaps not. Suppose we'd better plunge right in then.
Rastan? It's bllmmin' marvellous! I mean, even Jonathan liked it, Megagaming it back in '88, which must say something for it. Okay, quibblers, so it's hardly the most original piece of programming ever (after all, horizontally-scrolling running-along-slicing-'em-ups are hardly thin on the ground for the Spec), but this certainly is one of the best around, and still looks a corker after all these years. Huge graphics (avec colour), nice tunes (especially on the 128), smooth scrolling (it also slides up and down when you go up ladders and down pits and things - I forgot about that), a spooky sort of icon add-on weapons bit, octillions of levels - heck, I could go on for hours. If you like slash-'em-ups you'll love Rastan. If you don't you'll hate it (and be missing out on quite a lot).
(Your guess is as good as ours.)