It’s pretty much like Dead Space 2’s zero gravity but in first person AND it retains your momentum. You don’t stop moving when you let go of the joystick, you need to accelerate in the opposite direction. It’s super disorienting in the best kind of way.
Obviously you shouldn’t have zero gravity in the WHOLE game. It would get nauseating to look at. But it’s part of why those levels stand out so much. Easily the best parts of the game.