It didn't work for you because you only left 1 gap at the parity spot, so apples would just keep spawning in front of you until you killed yourself with 1 space remaining.
It didn't work because you were on multi mode, where you need to leave at least 3 spaces free (I'd go with 5 usually) at the ending if you want to survive. Then when you reach a high enough count, you close it down at the ending spiral - in hopes you didn't run into yourself earlier from apple spawns (could happen before 251, that's the risk). Look at my 252 multi runs, you can filter to show hidden runs and see how it's done.
The mod team are happy to announce that all slow runs have officially been moved from Category Extensions to the Base Game, meaning if you want to submit a slow speed run, you'll now need to submit to the Base Game, not Category Extensions.
We'd like to give a HUGE thanks to Maximum from the Red Ba
