Uhm... I don't know about that.. I think "bullet hells" are usually games like.. let's see... Ikaruga. For a third person bullet hell game Nier: Automata definitly has some parts of it.. I'll had a link to a boss fight with bullet hell elements :)
https://www.youtube.com/watch?v=-qNpJwqhgAA
But don't get me wrong please.. as I said I really and I mean REALLY liked the game, it was awesome :)