I still think it's overrated. The C64 version is just a bit too much of a tech demo, the scrolling is far too fast to really be playable and frankly it looks a bit ugly. The Spectrum (and by extension Amstrad) versions are, conversely, a little bit too slow and full of some horrendously unfair bits like those X things that home in on your ship, are indestructible and almost impossible to avoid. If the C64 version had been slowed down just a tad, given more forgiving earlier levels and had a bit more artistry on the graphics, I might have rated it.