I think virtuall every game by the Bitmap Bros.
Xenon II - I quite liked it but is was a disappointment afeter all the hype.
Magic Pockets - agree with the earlier posts.
Cadaver - no that much of an advance from isometric perspective games on the Spectrum - I think Head Over Heels was a better game.
Gods - everyone seemed to like it but I found it quite a dull action platformer. Much better was available on the Megadrive, such as Revenge of Shinobi.
There may be more I just can't remember them all.