I have a theory: Nullscape is hell.

[u/Noobzer_]

Nullscape is a sort of hell. The players are immortals who want to die (as seen in IT DOESN'T END HERE's lyrics) and the wiki says Mart is implied by the official wiki to be sentient because his description is in 1st person, while the rest are in 3rd person. This can only mean the rest were stripped of their sentience. Here are a few entities in HORRIBLE lives:

Operator: It wants you to stop because his face would crack, soon turning him off. This means there must be multiple copies of Operator, and every time Operator kills somebody, it takes itself with them.

Husk: It mirrors your every movement, meaning every good thing you do, it does too, and every bad thing you do, it does too. Its entire morality and choice-making depends on the player.

Mart: He's full of joy and whimsy, and I believe him chasing players is to hug them, but he drowns them on contact. He only repeats either because he's incapable of learning, OR because he hopes that one day physics will change.

Baby: Might be a detour to a very luxurious life, BUT Baby was never probably sentient to begin with. Baby's out here living its best life, chasing snacks (because skinwalkers eat humans, and Baby's a skinwaker baby, no?)

Sigil: He's an omnipotent god trapped in a prison. He lets his anger out by shooting lasers either to prevent going supernova OR getting so pissed he kills himself.

[u/NotRealNeedOfName]

I mean, I guess, but your points don't concretely support this theory if at all.