I've played through the whole game on every difficulty except easy, and was wondering what difficulty I should submit if I wanted an official run?

Light Bearers, I've got my time down to 18 seconds depending how you measure it

I've been following a bunch of speedrunners for a while now and always found it interesting, well to keep it short I recently found a multiplayer game with a short single player tutorial level, I started playing the tutorial while waiting for friends to get on and ended up trying to optomize for speed. I decided I might as well post it here since I haven't seen any runs for it yet on this site and might as well try my own hand at the game.