Don`t know if you talking about Syahata's Bad Day, but you can basically play through the entire game with only killing the bosses.
You can just "offer" yourself to the enemies, which causes them to insta grab you, but you don`t receive any damage.
You can then smash out of the grab, get the invic frames and can just walk through anything till the frames are off, then you just get yourself grabbed by the next enemies.
Only the 2 bosses don`t accept your "surrender" and will hit you. But till then you have enough ammunition to just blast them.