Board Thread:General Discussion/@comment-28554555-20160525232229/@comment-25495690-20161223085626

simpler non-meta reason

he kills you, you reload. it ain't exactly like "Ok he's dead, I have exactly 3 minutes to absorb him before he loads!", the whole point of determination is that, things just refuse to die in the first place.

and "unavoidable attack" or no, Flowey himself states that he hasn't been able to kill Asgore on his own.

as for the end game, 36kills or not, that power he wields is not his own, he doesn't try to stop the heals because he can't, and you know, the actual meta reason of, You as a player have the IRL determination to keep playing undoing Flowey's 1s and 0s determination. The game plays on both planes of existence which is masterful and pretty much explains the very existence of Chara... but that's a can of worms for another day.