Ok so the following advice is very risky for anyone attempting it.
So I learned that trapping yourself between an immovable object (such as a wall or door) and another object such as a chair or large block, if you squish yourself in between them at just the right position, you can do one of two things. If you jump up and down repeatedly, you’ll gain immense momentum, and once you get out of the position and leap in any directoin, you pretty much will turn into a rocket. You can escape basically any entity, you can clear a good chunk of Level ! almost instantly. the issue is you need to land with your flat completely flat on impact or you WILL break nearly every bone in your body. Still useful.
The other application is that if you just run into the wall and push yourself off the other object, you can noclip out of the area. If you apply this with other techniques similar to this, you can even fly around and clip back in.
Just be careful as you have a chance to noclip into other levels or into the void.
Doing the “air bottle jump” will help you get out of the void though.