What is MASL?

Cited from esolangs.org:

Matto's Assembly-Styled Language is an interpreted esoteric programming language that looks like assembly but really isn't assembly. It was made by Matto. The first version (v1.0.0-beta1) was released on August 5th 2022 and the latest version (v1.0.0-beta6.1) was released on September 1st 2022. The language is still in beta development. There have been a total of 8 releases and pre-releases.