Didn't move at all, top 81% of all time.

Seems about right, no? What number would you expect?

Of the 19% of the players worse than you, some tried to die quickly on purpose, others were perhaps less lucky than you...

The Top 81% calculation in the game is not as good as it may sound. Top 100% means you are at the bottom. You can confirm this by just losing immediately, which will place you in the Top 9X%.

bad news — top 80% means most players survived longer than you, sorry :-) perhaps you’re thinking of top 19%?

but you’re right, lots of bullet hells get easier if you hold still and only move when required.