R-type on the CPC, like Uukrul said, is identical to the Spectrum. I think the Spectrum version is great for a Spectrum, but not for an Amstrad game .
Yet I think they had to put a "Psygnosis" trademark somewhere..
When I 1st got the spectrum version, I saw only the name "Beast", and no Psygo copyright, I thought they had just stole the game idea or something (Although a big company like Gremlin woulnd't do that)
The same happens in the CPC version...
Oh yeah, and Silkworm on CPC is indeed great