You mean that Activision didn't produce that game for OS4? :-)
I agree, and ported games versus original games would not be good for such a competition either.
Yes, the best will be split the prize in two categories, the best original Amiga game (OS4, 68k, AROS, Mor..) and the best porting for Amiga systems. Because if someone will make an Amiga game 100% is imposible for him or them, compete against games with spectacular graphics, sounds and music background but in projects of other plataforms where there are much people working in it, an Amiga current game, only are working 1-2 persons, and programming, graphics, sound, music, it is impossible for few people against the source port teams.