Again, I wouldn't really put that on Ana. I think the devs just realised that they now had 8 previous player characters without any idea of what to do with them and had to some off. Better than what they did with Brick and Mordecai...

So in TPS, almost every area is low grav. And quite a lot of the areas have no air. So you need an OZ kit (o2 kit), to breath. You find oz kits like any other piece of loot and they offer different oxygen capacities. They also gave you the ability to ground slam, and between ground slams and O2 capacity you had another gear slot to keep an eye out for. Good stuff (at least until you found the oz kit that reduced the cost of boosting and never changed again...)

Now, this did mean that you were 'tethered' to oxygen supplies. You couldn't stand out in the middle of nowhere forever or you'd choke to death. But honestly I never found that to be a problem. The maps are dotted with geysers which refill your air, most buildings have a forcefield and are breathable within, and you can find o2 canisters inside crates and such.

But aside from the slam the best thing the oz kits could do could boost you. So doubletapping jump in middair would 'boost' you in one direction (consuming some air to do so), like a double jump. This was slower than a car but much faster than running when you're in a low grav area. It made it so much more fun to run around! Something you do constantly in BL! It wasn't overpowered since you had no control once you boosted but that just made traversal into a little minigame of steering your boosts, managing your oxygen, jumping onto objects to get height for your next boost, and generally enjoying flying through the air.