*Bionic Commando : there is even inverted/negative coloured sprites.
*Sabrina : same as Bionic commando...
*Gauntlet 3 : HUD is properly recoloured (3 shades) but in-game window is monochrome...(1bit coded sprites and tiles)
Some of those games were still good, as they were yet very good on Speccy, the Amstrad Portage wasn't enough to waste it. But those remained inferior to their original Speccy counterpart (which was oftem smoother or faster...).