Major spoilers to this game.
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1-This game actually explains (indirectly) the ''real truth'' of the ''Nulls''. I was hoping someone will pick up on it but I guess I made it too vague.
Basically, after CC hacked the general settings file at the end of the game she ''shaped her hand like a gun and snapped her fingers'' the same way Nulls like ''Ellie'' and ''Zero'' do when they use their Null power.
Also at the end of the game ''Null'', CC asks ''Zero'' to override the system and present you with '' choices'' meaning ''Nulls'' can control the game itself to a certain degree. So if you combine all these facts then you'll realize ''the real identity'' of Nulls.
They may be fourth-dimensional beings with superhuman power abilities who observe the timelines in the story but in ''our world'', they are ''Game admins''. A group of ''Game AI '' that moderates the games and their progression. Their superhuman powers are explained by having the ability to modify their character files like how Lisa did.
''Snakeys'' and other Null-related questions will be explored in the future game where the main cast of the series goes to the Null's world so I don't want to spoil that game.
2- Unlike the rest of the characters, CC goes through the games in order of release ( not chronological order) so the CC in recent games like Devotion, time letter, and Zero One is a ''post Null CC''. How is that possible will be explored in future games too .