It’s crazy to think someone could win at level 60 in the first place.
No… perhaps if you properly strengthened all your equipment and status… and you ignored all of the casualties around you, focusing only on victory… The Spirit Turtle’s attacks are slow, so it might be possible.
Of course, that only applies if you can take out the Head and Heart at the same time.
And from what I’ve seen, Ren has only been using the reinforcement methods from his own game.