Should this be submitted as a level 3 run, as 20 seconds, or no, because he did not start on the first platform.
Also, what would you guys think about adding milliseconds?

I'm required to accept or decline in 2 weeks, so responding in a week would help a lot.
If no one responds I will have to decline it.

No, It would save time

decline. speedruns should have strict rules, especially for where your character has to be when time starts/ends.

i would also recommend putting some sort of indication (like a different colour) on the brick that marks the beginning for each floor (especially considering you have ILs for each level)

Ok thanks