Does it strictly HAVE to be vanilla Mari0 or can we Speedrun with other versions like Alesan 99's Entities?

I ask because I'd like to speed run using Chell Alt from this thread as well as take on other mappacks.

iirc from running both (granted like 6 years ago) the physics are different in Alesean. I think it was something like gaining momentum through portals unlike in vanilla.

If you want to run Alesan there is an Alesan board.