Game Sack-Games That Defy Genre
Good as always!
Other genre defying:
Panic (SegaCD) - It's just a hot mess
Odama (GC) - Pinball tactical sim?
Seaman (DC) - Okay, so it's sort of like pikachu
I did think of Cabal/Blood Brothers/Nam '75/Gamshara style of games, but they would be more defining "behind that back, target shooter" type games rather than defying.