Can we do a category that starts when the first actual puzzle of the game starts and call it no intro

was asked in the discord server, where a no was given

Unfortunately...no. The answer was already given in the Discord Server. Every speedrun starts the moment where you give the game the first input before the actual start of the game (in this case when you press confirm in the main menu)

The "Start of the game" is when you gain control of the character.