New
Subnautica update, therefore new playthrough.
I'm gonna be honest, I'm not really a fan of the changes brought by this update. The biggest change for this update is how the Cyclops submarine works. The Cyclops is the biggest sub you can build in the game, and basically works as a mobile base, in that you can build stuff in it for storage space, fabrication, growing food, etc. Previously it was invulnerable to everything except being crushed by water pressure when you went too deep. Now it'll be attacked by predators (even small ones like bonesharks) all of which will do damage to the sub. Take too much damage and fires start breaking out, which you'll need to extinguish by running around with a handheld fire extinguisher. Take further damage after that and you'll have to abandon ship as your hard-won sub sinks to the bottom of the seafloor.
An invincible submarine is pretty unbalanced, so I can understand allowing the Cyclops to take damage. The current implementation is rather wonky though. The Cyclops has absolutely no way to fight back against enemies, it can only run away while deploying decoys to draw their attention. It can defend itself with a 15-second shield, and you can equip the Cyclops with a fire suppression system, but on the whole the Cyclops has been hugely nerfed, and using it feels like a chore.
However, and I'm not sure if this is just my personal perception or if this has been an actual change, I feel like the aggressiveness of enemies has been ramped up significantly when you're in your PRAWN exosuit. I keep getting killed by Warpers warping me out of my PRAWN and clawing me to bits. The Sea Dragon Leviathan also tends to like to grab my PRAWN and do super effective damage to it (and I can't exactly repair the PRAWN afterwards because there's a Sea Dragon Leviathan chewing on it). I feel like this is the devs trying to force players to use the new Cyclops by making the player's life a living hell in the PRAWN.
Some other minor changes are not great either. The UI has been changed so that you can no longer see the exact numerical percentages for your health, hunger, and thirst. More realistic, perhaps, but definitely less convenient. A lot of resources have new models and images in your inventory, except for some reason the devs have decided to turn them all into
slightly different variations of grey metallic blobs. This makes it hard to visually distinguish them in your inventory, unless you mouse over them or memorize their shapes. Spotting them in the gameworld is also harder now, because they're all grey metallic blobs.
Admittedly there are some good changes. New areas have been added, and the recipes for some objects have been changed so silver is no longer the bottleneck it used to be (copper is actually my biggest bottleneck now). But on the whole it feels like some of these changes have made exploration rather less fun.