Does anyone know other Amigagames which have transformed in a whole new game during the conversion process to another system?
No, but I know a C64 game that's been turned completely upside-down (as an advantage) before releasing it on the Miggy.
Play Rogue Trooper
on a C64 and then on an Amiga.
It's like two absolutely different games. Graphics of the C64 version look quite Speccy-ish.