This really is just a more fleshed out version of the first game. The world is far bigger (an actual planet with different biome regions) the goal is basically the same (go up, find a thing, go up etc) and there are more "powers". You can scan different plants which do various things and you can spawn them at will. Catapults, bouncey pads, plants that shoot up into the air, vertical stalks to climb, etc. You're far more versatile.
One thing that I noticed though. It feels a little more jankier, but in the bad way. The first had a procedural animation style that looks clumsy and a little hard to control but ultimately it worked as intended. In this one the player character seems to trip up more, the arms and legs get caught up in the geometry more... especially when climbing objects which makes it hard to climb. It's not a huge deal but it;s weird.
Having fun with it just like the first.