Completed Volt Forge and reach Sol Valley with the bike.
The boss of the former was freaking awesome, one of my favourite in the Prime series. Making the process of getting the bike an entire "dungeon" where you navigate and restart the factory that makes them was a cool concept too.
Now that I've had a chance to really test out the bike and explore the open world, both are fine. Neither is amazing or revolutionary, but they're certainly not bad and are enjoyable overall. Same goes for the physic powers; though the way they are presented and worded narratively feels kinda hokey, mechanically they're solid.
I feel like that's the game's only real issue so far, that while it's well made and enjoyable, it doesn't bring a killer new hook like Prime 1's incredible immersion and perfect translation of the Metroidvania formula to 3D back in 2002 or Prime 3's revelatory pointer controls in 2007. What new stuff it does try is mostly well done, just nothing mind-blowing.
Still, after an 18 year hiatus, a game that's mostly familiar isn't a bad thing by any means, especially when the core fundamentals of the series like enthralling alien worlds and immersive exploration are still terrific.