I reached what is presumably the boss of Undertale Yellow's neutral route:
After Flowey killed Martlet, I was thrown into a fight against a nightmare version of Flowey. Every time I die my soul refuses to shatter and the fight resumes. Flowey's dialogue implies it's an unwinnable fight. Selecting any option other than Check or Spare rejust gets ignored. I've been at the fight for a while but can't tell if I'm making any progress. Considering this game is a prequel to Undertale, a game where Clover is already dead, I'm starting to suspect this could actually be an unwinnable fight.
Is it possible to win this fight?